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Transformations

Practice exam-style IB Math AI questions for Transformations, aligned with the syllabus and grouped by topic.

Paper
Difficulty
Status
Level
Question 1
HL • Paper 1
Easy
Calculator Permitted

Starting with the graph of f(x)=x2f(x)=x^2, two sequences of transformations are considered.

Sequence A translates the graph 22 units upwards and then applies a vertical stretch with scale factor 33.

Sequence B applies the vertical stretch first and then translates the graph 22 units upwards.

A

Find the function obtained from sequence A.

[2]
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B

Find the function obtained from sequence B.

[2]
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C

State the vertical distance between the two resulting graphs.

[1]
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0

Question 2
HL • Paper 1
Easy
Calculator Permitted

For a product, Q=f(P)Q=f(P) models weekly demand QQ, in units, at a price PP dollars. Following an advertising campaign, demand is modelled by

g(P)=1.2f(P5)+30g(P)=1.2f(P-5)+30

Before the campaign, the point (20,200)(20,200) lies on the demand curve.

A

Interpret each of the three transformations in the context of the model.

[3]
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B

Determine the point on the new demand curve corresponding to (20,200)(20,200), and interpret its coordinates.

[2]
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0

Question 3
HL • Paper 1
Medium
Calculator Permitted

The graph of y=f(x)y=f(x) contains the points A(2,5)A(-2,5) and B(4,1)B(4,-1). The graph is transformed to the graph of

g(x)=2f(3(x1))+4g(x)=-2f(3(x-1))+4
A

Determine the coordinates of the image of AA on the graph of gg.

[2]
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B

Determine the coordinates of the image of BB on the graph of gg.

[2]
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0

Question 4
HL • Paper 1
Medium
Calculator Permitted

The graph of y=f(x)y=f(x) has xx-intercepts at x=3x=-3 and x=1x=1, and a local maximum at (0,4)(0,4). A new function is defined by

h(x)=12f(2x)h(x)=-\frac12f(-2x)
A

Describe fully the transformations that map the graph of ff onto the graph of hh.

[4]
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B

Find the xx-intercepts of the graph of hh.

[1]
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C

State the coordinates and nature of the turning point on the graph of hh.

[1]
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0

Question 5
HL • Paper 1
Medium
Calculator Permitted

The height of an animated fountain jet is modelled by

h(t)=12(t4)2+8h(t)=-\frac12(t-4)^2+8

where tt is the time in seconds and hh is the height in metres. A second animation starts 33 seconds later, runs at twice the speed and displays the jet at 1.51.5 times its original height.

A

Determine a function H(t)H(t) that models the second animation.

[2]
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B

Find the time and height of the maximum point in the second animation.

[2]
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C

Find the two times at which the second animation shows the jet at ground level.

[1]
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0

Question 6
HL • Paper 1
Medium
Calculator Permitted

The function gg is defined by

g(x)=3cos(2(xπ4))+1g(x)=-3\cos\left(2\left(x-\frac{\pi}{4}\right)\right)+1
A

Describe a sequence of transformations that maps the graph of y=cosxy=\cos x onto the graph of gg.

[5]
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B

The point (0,1)(0,1) is a maximum point on y=cosxy=\cos x. Determine its image and state its nature on the graph of gg.

[2]
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0

Question 7
HL • Paper 1
Medium
Calculator Permitted

Let f(x)=lnxf(x)=\ln x. A transformed function is defined by

g(x)=2f((x3))+4g(x)=2f(-(x-3))+4
A

Describe a sequence of transformations that maps the graph of ff onto the graph of gg.

[4]
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B

State the domain of gg and the equation of its vertical asymptote.

[2]
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0

Question 8
HL • Paper 1
Medium
Calculator Permitted

A voltage signal is modelled by V=f(t)V=f(t), where tt is measured in seconds and VV in volts. A second sensor delays the signal by 0.40.4 seconds, reverses its polarity, amplifies its magnitude by a factor of 2.52.5, and adds an offset of 0.10.1 volts. The original signal has a local maximum at (1.2,0.8)(1.2,0.8).

A

Determine a function G(t)G(t) for the output of the second sensor.

[3]
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B

Determine the image of the local maximum and state its nature on the graph of GG.

[3]
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0

Question 9
HL • Paper 1
Medium
Calculator Permitted

The graph of a non-symmetric function ff is shown. It has endpoints (4,1)(-4,1) and (2,5)(2,5), a local minimum at (1,2)(-1,-2) and an xx-intercept at (12,0)\left(\dfrac12,0\right). A new function is defined by

g(x)=f(x)+3g(x)=f(-x)+3
Original graph of f with endpoints, local minimum, and x-intercept marked.
A

Determine the images of the local minimum and the specified x-intercept at (12,0)\left(\dfrac12,0\right) under the transformation.

[2]
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B

On a coordinate grid, sketch the graph of gg, clearly indicating its endpoints and local minimum.

[3]
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0

Question 10
HL • Paper 1
Medium
Calculator Permitted

Let f(x)=exf(x)=e^x. The graph of ff is translated by the vector

(ab)\begin{pmatrix}a\\b\end{pmatrix}

to form the graph of gg. The graph of gg passes through (0,3)(0,3) and (ln4,9)(\ln 4,9).

A

Write down an expression for g(x)g(x) in terms of aa and bb.

[1]
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B

Find the value of aa and the value of bb.

[4]
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0

Question 11
HL • Paper 1
Medium
Calculator Permitted

Let

f(x)=1x2+3f(x)=\frac{1}{x-2}+3

A new function is defined by

g(x)=2f(12(x+4))+1g(x)=-2f\left(\frac12(x+4)\right)+1
A

Express g(x)g(x) in the form axh+k\dfrac{a}{x-h}+k.

[2]
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B

State the equations of the asymptotes of the graph of gg.

[2]
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C

State the domain and range of gg.

[2]
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0

Question 12
HL • Paper 1
Medium
Calculator Permitted

A function ff has domain [2,5][-2,5] and range [1,7][-1,7]. A function gg is defined by

g(x)=12f(42x)3g(x)=\frac12f(4-2x)-3

It is also known that f(1)=6f(1)=6.

A

Determine the domain of gg.

[2]
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B

Determine the range of gg.

[2]
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C

Find the point on the graph of gg corresponding to the point (1,6)(1,6) on the graph of ff.

[2]
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0

Question 13
HL • Paper 1
Medium
Calculator Permitted

Let f(x)=x2f(x)=x^2. A transformed function has the form

g(x)=pf(q(xa))+bg(x)=p f(q(x-a))+b

where p>0p>0 and q>0q>0. The graph of gg has vertex (3,2)(3,-2), is obtained using a horizontal stretch with scale factor 22, and passes through (5,6)(5,6).

A

Find the values of aa and bb.

[2]
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B

Find the value of qq.

[1]
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C

Find the value of pp and hence write down g(x)g(x).

[3]
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0

Question 14
HL • Paper 1
Medium
Calculator Permitted

The graph of y=f(x)y=f(x) is transformed to the graph of

g(x)=4f(x+63)+2g(x)=-4f\left(\frac{x+6}{3}\right)+2
A

Describe a sequence of transformations that maps the graph of ff onto the graph of gg.

[3]
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B

The point (2,1)(2,-1) lies on the graph of ff. Determine its image on the graph of gg.

[2]
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C

The point (9,10)(9,-10) lies on the graph of gg. Determine the corresponding point on the graph of ff.

[2]
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0

Question 15
HL • Paper 1
Medium
Calculator Permitted

Let f(x)=1xf(x)=\dfrac1x. A transformed function is defined by

g(x)=af(b(xc))+dg(x)=a f(b(x-c))+d

where a>0a>0 and b>0b>0. The graph of gg has vertical asymptote x=2x=2, horizontal asymptote y=1y=-1, and is obtained using a horizontal stretch with scale factor 22. It also passes through (3,1)(3,1).

A

Find the values of cc, dd and bb.

[3]
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B

Find the value of aa and hence write down g(x)g(x) in simplified form.

[3]
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0

Question 16
HL • Paper 1
Medium
Calculator Permitted

Let TT denote a translation 33 units to the right and let SS denote a horizontal stretch with scale factor 22. These transformations are applied to the graph of y=f(x)y=f(x) in different orders.

A

Find the function obtained when TT is applied first and SS second.

[2]
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B

Find the function obtained when SS is applied first and TT second.

[2]
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C

point on the original graph has xx-coordinate rr. Compare its final xx-coordinates under the two sequences.

[2]
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0

Question 17
HL • Paper 2
Medium
Calculator Permitted

Let

f(x)=1x+1f(x)=\frac{1}{x+1}

and define

g(x)=2f(x42)+3g(x)=-2f\left(\frac{x-4}{2}\right)+3
A
I.

Describe a sequence of transformations that maps the graph of ff onto the graph of gg.

[2]
Write your answer here...
II.

Express g(x)g(x) in the form axh+k\dfrac{a}{x-h}+k.

[2]
Write your answer here...
B

State the equations of the asymptotes of the graph of gg.

[2]
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C

The line y=1y=1 intersects the graph of gg at PP. Determine the coordinates of PP and the corresponding point on the graph of ff.

[2]
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0

Question 18
HL • Paper 2
Medium
Calculator Permitted

Let f(x)=xf(x)=|x| and define

g(x)=2f(x+32)+6g(x)=-2f\left(\frac{x+3}{2}\right)+6
A
I.

Describe the transformations that map the graph of ff onto the graph of gg.

[2]
Write your answer here...
II.

Write g(x)g(x) in simplified form and state the coordinates of its vertex.

[2]
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B

Find the xx-intercepts of the graph of gg.

[2]
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C

Determine the coordinates of the intersections of gg with the line y=0.5x+2y=0.5x+2.

[2]
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0

Question 19
HL • Paper 2
Hard
Calculator Permitted

The vertical displacement of a test platform is modelled by

f(t)=tet,t0f(t)=te^{-t},\qquad t\geq 0

where tt is measured in seconds. A second sensor produces the transformed signal

g(t)=3f(2(t0.4))+0.2,t0.4g(t)=-3f(2(t-0.4))+0.2,\qquad t\geq 0.4

The graph of ff has a maximum point at (1,e1)(1,e^{-1}).

A
I.

Describe the transformations that map the graph of ff onto the graph of gg.

[3]
Write your answer here...
II.

Determine the image of the maximum point of ff, giving coordinates to three significant figures, and state its nature on the graph of gg.

[2]
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B

Find the two values of tt for which g(t)=0.5g(t)=-0.5.

[2]
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C

Explain why the maximum displacement of ff becomes a minimum displacement of gg.

[1]
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0

Question 20
HL • Paper 2
Hard
Calculator Permitted

The depth of water above a reference level at a harbour is modelled by

H(t)=1.8sin(t22)+3.2H(t)=1.8\sin\left(\frac{t-2}{2}\right)+3.2

where tt is measured in hours and 0t2+4π0\leq t\leq 2+4\pi.

A
I.

Describe the transformations that map y=sinty=\sin t onto y=H(t)y=H(t).

[2]
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II.

Determine the time and depth of the first maximum value of HH.

[2]
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B

Find the two times during the cycle when H(t)=4H(t)=4.

[2]
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C

Hence determine the length of time during the cycle for which the depth is at least 44 metres.

[2]
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0

Question 21
HL • Paper 2
Hard
Calculator Permitted

A calibration curve is obtained from the graph of f(x)=lnxf(x)=\ln x using

g(x)=1.5f(2(8x))+4g(x)=-1.5f(2(8-x))+4
A
I.

Describe the horizontal transformations that map the graph of ff onto the graph of gg.

[2]
Write your answer here...
II.

Describe the vertical transformations that map the graph of ff onto the graph of gg.

[2]
Write your answer here...
B

State the domain of gg and the equation of its vertical asymptote.

[2]
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C

Find the value of xx for which g(x)=1g(x)=1.

[2]
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0

Question 22
HL • Paper 2
Hard
Calculator Permitted

The temperature of a container is modelled by

C(t)=18+62e0.12t,t0C(t)=18+62e^{-0.12t},\qquad t\geq0

A second container begins cooling after a delay of 55 minutes. It cools 1.41.4 times as slowly, its temperature difference from the original baseline is multiplied by 0.80.8, and its new baseline is 22C22^\circ\text{C}.

A
I.

Write down the input of CC that accounts for the delay and slower cooling.

[2]
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II.

Hence determine a model D(t)D(t) for the second container.

[2]
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B

Find the time at which the second container first reaches 30C30^\circ\text{C}.

[2]
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C

Explain why replacing C(t)C(t) directly by 0.8C(t)0.8C(t) would not model the stated vertical change correctly.

[2]
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0

Question 23
HL • Paper 2
Hard
Calculator Permitted

A retailer models weekly demand by Q=f(P)Q=f(P), where PP is the price in dollars and QQ is the number of units demanded. Two points on the original demand curve are (18,260)(18,260) and (30,140)(30,140). A new market has demand

g(P)=0.75f(1.2(P10))+40g(P)=0.75f(1.2(P-10))+40
A
I.

Write down the coordinate mapping from a point (P,Q)(P,Q) on the original demand curve to the corresponding point on the new demand curve.

[2]
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II.

Determine the images of the two given points.

[2]
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B

Calculate the weekly revenue represented by each transformed point and determine which is greater.

[2]
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C

The point (20,250)(20,250) lies on the new demand curve. Determine the corresponding point on the original demand curve.

[2]
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0

Question 24
HL • Paper 2
Hard
Calculator Permitted

Let f(x)=xf(x)=\sqrt{x} and define

g(x)=3f(14(x8))2g(x)=3f\left(-\frac14(x-8)\right)-2
A
I.

Describe the horizontal transformations that map the graph of ff onto the graph of gg.

[2]
Write your answer here...
II.

Describe the vertical transformations that map the graph of ff onto the graph of gg.

[2]
Write your answer here...
B

State the domain and range of gg.

[2]
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C

Find the point on the graph of gg at which y=4y=4.

[2]
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0

Question 25
HL • Paper 2
Hard
Calculator Permitted

A numerical model is defined by

F(x)=(x1000000)2F(x)=(x-1\,000\,000)^2

Values of xx used in the model are close to 10000001\,000\,000.

A
I.

Describe the transformation that maps y=x2y=x^2 onto y=F(x)y=F(x).

[2]
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II.

Introduce the local coordinate u=x1000000u=x-1\,000\,000 and express FF in terms of uu.

[2]
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B

Calculate F(1000000.003)F(1\,000\,000.003).

[2]
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C

Explain why storing the local coordinate u=x1000000u=x-1\,000\,000 directly, rather than first rounding x=1000000.003x=1\,000\,000.003 to six significant figures, can reduce rounding error.

[2]
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0

Question 26
HL • Paper 2
Hard
Calculator Permitted

The intensity profile of a light pulse is modelled by f(t)=et2f(t)=e^{-t^2}. A modified pulse is modelled by

g(t)=4f(1.5(t2))+0.5g(t)=4f(1.5(t-2))+0.5
A
I.

Describe the transformations that map the graph of ff onto the graph of gg.

[2]
Write your answer here...
II.

State the coordinates of the maximum point and the equation of the horizontal asymptote of gg.

[2]
Write your answer here...
B

Find the two values of tt for which g(t)=2.5g(t)=2.5.

[2]
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C

Hence determine the width of the pulse above an intensity of 2.52.5.

[2]
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0

Question 27
HL • Paper 3
Hard
Calculator Permitted

A graph-design program transforms y=f(x)y=f(x) into
g(x)=pf(q(xa))+bg(x)=p f(q(x-a))+b
where p>0p>0 and q>0q>0. The points U(2,5)U(-2,5) and V(4,1)V(4,-1) on the original graph are mapped to U(1,12)U'(1,12) and V(4,0)V'(4,0) respectively.

Original graph f and transformed graph g with marked corresponding points U, V, U' and V'.
A

Consider a general point (u,v)(u,v) on the graph of ff.

I.

For a point (u,v)(u,v) on the graph of y=f(x)y=f(x), show that its image on the graph of gg has coordinates:

(a+uq,b+pv)\left(a+\frac{u}{q},\,b+pv\right)
[2]
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II.

State the horizontal and vertical scale factors represented by this mapping.

[2]
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B

Hence determine pp, qq, aa and bb.

[5]
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0

Question 28
HL • Paper 3
Hard
Calculator Permitted

A recorded seismic signal is represented by A=f(t)A=f(t), where tt is measured in seconds and AA in millimetres. A processed signal is defined by
G(t)=1.5f(2(t0.8))+0.2G(t)=-1.5f(2(t-0.8))+0.2
The original signal has a local maximum at (1.6,0.9)(1.6,0.9) and crosses the time axis at t=0.4t=0.4 and t=2.8t=2.8.

Original seismic signal f(t) with its local maximum and zero crossings marked.
A

Describe the four transformations mapping the original signal to the processed signal.

[4]
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B

Consider the local maximum and the axis crossings of the original signal.

I.

Determine the image of the local maximum and state its nature.

[3]
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II.

Find the two times at which G(t)=0.2G(t)=0.2.

[2]
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0

Question 29
HL • Paper 3
Hard
Calculator Permitted

A graphics filter uses the parent curve
f(x)=2x+13f(x)=\frac{2}{x+1}-3
to generate
g(x)=2f(12(x4))+5g(x)=-2f\left(\frac12(x-4)\right)+5

Parent rational curve with asymptotes.
A

Analyse the construction of gg.

I.

Describe the transformations mapping the graph of ff to the graph of gg.

[2]
Write your answer here...
II.

Express g(x)g(x) in the form Axh+k\dfrac{A}{x-h}+k.

[2]
Write your answer here...
B

State the equations of the asymptotes and hence the domain and range of gg.

[3]
Write your answer here...
C

For a rational function with asymptotes x=rx=r and y=sy=s, state the asymptotes after the transformation y=pf(q(xa))+by=p f(q(x-a))+b, where pq0pq\ne0.

[2]
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0

Question 30
HL • Paper 3
Hard
Calculator Permitted

A repeating machine motion is based on the graph of y=f(t)y=f(t). One cycle of ff has a maximum at (1,4)(1,4), a minimum at (3,2)(3,-2) and the next maximum at (5,4)(5,4). A modified motion is
G(t)=12f(2(t3))+1G(t)=-\frac12f(2(t-3))+1

Periodic motion f(t) with labelled extrema.
A

Analyse the time transformation.

I.

Determine the period of ff and the period of GG.

[2]
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II.

Determine the image of the minimum (3,2)(3,-2) and state its nature.

[2]
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B

Determine the maximum and minimum values of GG.

[2]
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C

second modification has the form H(t)=Af(B(tC))+DH(t)=A f(B(t-C))+D. State conditions on AA and BB for HH to have the same period as GG but to preserve the nature of every turning point.

[3]
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0

Question 31
HL • Paper 3
Hard
Calculator Permitted

A digital elevation profile y=f(x)y=f(x) has domain [5,7][-5,7] and range [3,9][-3,9]. It begins at (5,4)(-5,4) and ends at (7,1)(7,1). A transformed profile is defined by
g(x)=3f(6x2)g(x)=3-f\left(\frac{6-x}{2}\right)

Non-symmetric original elevation profile with all vertices included as filled points and a solid line.
A

Determine the effect on the coordinates.

I.

Show that a point (u,v)(u,v) is mapped to (62u,3v)(6-2u,3-v).

[2]
Write your answer here...
II.

Determine the images of the two endpoints.

[2]
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B

Determine the domain and range of gg.

[2]
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C

Explain why the left endpoint of the transformed profile corresponds to the right endpoint of the original profile.

[2]
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0

Question 32
HL • Paper 3
Hard
Calculator Permitted

For a manufacturer, C=f(n)C=f(n) gives the daily operating cost CC, in euros, when nn items are produced. After equipment is replaced, the cost is modelled by
G(n)=0.8f(n1201.5)+600G(n)=0.8f\left(\frac{n-120}{1.5}\right)+600
The original graph contains the point (300,5400)(300,5400).

Original cost vs production curve showing the given point.
A

Analyse the transformations in context.

I.

State the horizontal scale factor and horizontal translation, including appropriate units.

[2]
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II.

Interpret the two vertical transformations.

[3]
Write your answer here...
B

Determine the transformed operating point corresponding to (300,5400)(300,5400) and interpret its coordinates.

[3]
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C

Explain why the value 600600 has units but the values 0.80.8 and 1.51.5 do not.

[1]
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0

Question 33
HL • Paper 2
Hard
Calculator Permitted

Let

f(x)=x33xf(x)=x^3-3x

and

g(x)=12f(2(x1))2g(x)=\frac12f(-2(x-1))-2

The graph of ff has a local maximum at (1,2)(-1,2) and a local minimum at (1,2)(1,-2).

A
I.

Write down the coordinate mapping from a point (x,y)(x,y) on the graph of ff to its image on the graph of gg.

[2]
Write your answer here...
II.

Determine the coordinates and nature of both turning points of gg.

[2]
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B

Find the xx-intercept of the graph of gg.

[2]
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C

student claims that the reflection in the yy-axis changes every maximum point into a minimum point. Explain why this claim is incorrect.

[2]
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0

Question 34
HL • Paper 2
Hard
Calculator Permitted

An animation is described by y=f(t)y=f(t) for 0t120\leq t\leq12. Let TT be a translation 33 seconds to the right and let SS be a horizontal stretch with scale factor 1.51.5.

A
I.

Find the function and domain obtained when TT is applied first and SS second.

[2]
Write your answer here...
II.

Find the function and domain obtained when SS is applied first and TT second.

[2]
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B

An event occurs at time t=rt=r in the original animation. Determine its final time under each sequence.

[2]
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C

Hence explain why the order of these transformations changes the animation.

[2]
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0

Question 35
HL • Paper 2
Hard
Calculator Permitted

The graph of y=f(x)y=f(x) is subjected to a vertical translation by bb units and a vertical stretch with scale factor pp, where p>0p>0.

A
I.

Find the function obtained when the translation is applied before the stretch.

[2]
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II.

Find the function obtained when the stretch is applied before the translation.

[2]
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B

Determine all conditions on pp and bb for which the two sequences produce the same graph.

[2]
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C

For p=2.5p=2.5 and b=4b=-4, determine the vertical distance between the two resulting graphs and explain why it is constant.

[2]
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Question 36
HL • Paper 2
Hard
Calculator Permitted

A path profile is modelled by

f(x)={x+2,2x<1,4x,1x4.f(x)= \begin{cases} x+2, & -2\leq x<1,\\ 4-x, & 1\leq x\leq4. \end{cases}

A transformed profile is defined by

g(x)=2f(3x)+1g(x)=-2f(3-x)+1
Graph of the original path profile f(x).
A
I.

Determine the transformed domain and the transformed location of the joining point.

[2]
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II.

Find a piecewise expression for g(x)g(x).

[2]
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B

State the range of gg.

[2]
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C

Show that gg is continuous at its joining point.

[2]
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Question 37
HL • Paper 2
Hard
Calculator Permitted

A cyclic environmental index is modelled by

g(t)=acos(b(tc))+dg(t)=a\cos(b(t-c))+d

where a>0a>0, b>0b>0 and 0c<100\leq c<10. The index has a maximum value of 77, a minimum value of 11, a period of 1010 days and a maximum at t=2t=2.

A
I.

Find aa and dd.

[2]
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II.

Find bb and cc, and hence write down the model.

[2]
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B

Find the first time after t=2t=2 at which the index is 55.

[2]
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C

Determine the total time during one period for which the index is greater than 55.

[2]
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Question 38
HL • Paper 3
Hard
Calculator Permitted

Let ThT_h denote a translation hh units to the right, where h>0h>0, and let HsH_s denote a horizontal stretch with scale factor ss, where s>1s>1. These transformations are applied to the graph of y=f(x)y=f(x).

Step

ThT_h then HsH_s

HsH_s then ThT_h

Starting graph

y=f(x)y=f(x)

y=f(x)y=f(x)

Point to track

(u,v)(u,v)

(u,v)(u,v)

1st transformation

ThT_h

HsH_s

2nd transformation

HsH_s

ThT_h

A

point on the original graph has coordinates (u,v)(u,v).

I.

Find its final coordinates when ThT_h is applied before HsH_s.

[2]
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II.

Find its final coordinates when HsH_s is applied before ThT_h.

[2]
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B

Determine the horizontal separation between the two final images of the point.

[2]
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C

Deduce the condition under which the two transformation sequences produce the same graph for every function ff (equivalently, when the transformation operators commute), and interpret this result for h>0h>0 and s>1s>1.

[3]
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Question 39
HL • Paper 3
Hard
Calculator Permitted

A sensor response has the shape of the parent function f(x)=lnxf(x)=\ln x. Its calibrated response is
g(x)=pln(q(xa))+bg(x)=p\ln(q(x-a))+b
where p>0p>0 and q>0q>0. The calibrated graph has vertical asymptote x=4x=4 and contains the points (5,2)(5,2) and (7,8)(7,8).

Calibrated logarithmic response with asymptote and given points.
A

Use the asymptote and the two calibration points.

I.

Determine aa.

[1]
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II.

Show that pln3=6p\ln 3=6.

[2]
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III.

The horizontal scale factor is known to be 22. Find pp, qq and bb, giving non-exact answers to three significant figures.

[3]
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B

Determine the image on the calibrated graph of the parent point (e2,2)(e^2,2).

[2]
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C

Explain why the same calibrated graph can be represented using different pairs of values for qq and bb if the horizontal scale factor is not specified.

[2]
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Question 40
HL • Paper 3
Hard
Calculator Permitted

A two-dimensional image-registration algorithm maps coordinates according to
X=a+xq,Y=b+pyX=a+\frac{x}{q},\qquad Y=b+py
where pq0pq\ne0. Three landmarks on the original image are A(3,2)A(-3,2), B(1,6)B(1,6) and C(5,1)C(5,-1). Their registered images include A(8,2)A'(8,-2) and B(6,10)B'(6,10).

Two simplified image strips showing corresponding labelled landmarks before and after registration, with horizontal and vertical coordinate directions.
A

Find the transformation parameters.

I.

Determine qq and aa.

[3]
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II.

Determine pp and bb.

[3]
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B

Determine the coordinates of CC'.

[2]
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C

Describe the reflections present in the registration and justify your answer.

[2]
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Question 41
HL • Paper 3
Hard
Calculator Permitted

A satellite's measured displacement is modelled near the large time value t0=108t_0=10^8 seconds by
D(t)=0.000003(tt0)20.04(tt0)+7D(t)=0.000003(t-t_0)^2-0.04(t-t_0)+7
A technician introduces the translated variable u=tt0u=t-t_0 and defines F(u)=D(u+t0)F(u)=D(u+t_0).

u [s]

t [s]

Displacement

-8000

99992000

519

-4000

99996000

215

0

100000000

7

4000

100004000

-105

6000

100006000

-125

8000

100008000

-121

10000

100010000

-93

16000

100016000

135

A

Work with the translated coordinate.

I.

Show that F(u)=0.000003u20.04u+7F(u)=0.000003u^2-0.04u+7.

[2]
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II.

Determine the translation mapping the graph of DD to the graph of FF when both are drawn using their stated horizontal variables.

[2]
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B

Find the value of uu at the turning point and hence the corresponding value of tt.

[3]
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C

Explain one numerical advantage of calculating with F(u)F(u) rather than expanding D(t)D(t) as a polynomial in tt.

[2]
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Question 42
HL • Paper 3
Hard
Calculator Permitted

The cross-section of a custom ramp is represented by an unfamiliar function y=f(x)y=f(x) on 0x100\le x\le10. It contains joins at (2,1)(2,1) and (7,4)(7,4) and has maximum point (5,6)(5,6). A second ramp is modelled by
g(x)=1.2f(x182)0.5g(x)=1.2f\left(-\frac{x-18}{2}\right)-0.5

Piecewise smooth ramp profile with joins and a maximum.
A

Analyse the transformation of key features.

I.

Describe the horizontal transformations.

[2]
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II.

Determine the images of the two joins.

[2]
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III.

Determine the image of the maximum point.

[2]
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B

Determine the domain of gg.

[2]
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C

Explain why the order of the two joins is reversed on the second ramp but their shape type is unchanged.

[2]
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Question 43
HL • Paper 3
Hard
Calculator Permitted

The graph of a function ff with domain DD, where D=DD=-D (for example, D=RD=\mathbb{R}), is transformed in two ways on this common domain:
g(x)=f(x),h(x)=f(x)g(x)=-f(-x),\qquad h(x)=f(x)
The accompanying diagram is illustrative only and is not data to be used in part (c).

A designer wants the graphs of gg and hh to coincide.

Illustrative, non-data diagram of reflections; it is not the graph used in part (c).
A

Interpret the transformation producing gg.

I.

Describe the two reflections mapping ff to gg.

[2]
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II.

State the equivalent single geometric transformation.

[2]
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B

Show that the graphs coincide if and only if ff is an odd function.

[3]
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C

State what can be deduced about the graph if it contains the point (4,7)(4,-7) and the two graphs coincide.

[2]
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Question 44
HL • Paper 3
Hard
Calculator Permitted

A curve is transformed by
T:(x,y)(5x3,2y4)T:(x,y)\mapsto\left(5-\frac{x}{3},2y-4\right)
A software system must later restore every point to its original position.

Transformation flowchart showing an original curve, the coordinate transformation T, and an unknown restoring transformation returning to the original curve.
A

Relate the coordinate mapping to a graph equation.

I.

If the original graph is y=f(x)y=f(x), show that its image has equation
g(X)=2f(153X)4g(X)=2f(15-3X)-4

[3]
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II.

State the horizontal reflection and horizontal scale factor used by TT.

[1]
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B

Find the restoring coordinate transformation T1T^{-1}.

[3]
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C

Verify that applying T1T^{-1} after TT returns a general point (x,y)(x,y) to itself.

[3]
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Question 45
HL • Paper 3
Hard
Calculator Permitted

A transformation maps every point according to
T(x,y)=(2x3,12y+4)T(x,y)=(2x-3,\tfrac12y+4)
A point is called invariant if it is unchanged by the transformation.

Sample orbit under the transformation T, showing repeated images of one point.
A

Find the invariant point.

I.

Solve for the invariant xx-coordinate.

[2]
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II.

Solve for the invariant yy-coordinate and hence state the invariant point.

[2]
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B

Show that after applying TT nn times, the coordinates are
xn=3+2n(x03),yn=8+2n(y08)x_n=3+2^n(x_0-3),\qquad y_n=8+2^{-n}(y_0-8)

[3]
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C

Describe the long-term behaviour of the image of a point with x03x_0\ne3 as nn\to\infty.

[2]
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Question 46
HL • Paper 2
Hard
Calculator Permitted

A non-symmetric function ff has endpoints (0,1)(0,1) and (6,1)(6,-1) and a local maximum at (2,5)(2,5). It is transformed according to

g(x)=pf(q(xa))+bg(x)=pf(q(x-a))+b

where q>0q>0. The corresponding features of gg are endpoints (1,0)(1,0) and (13,4)(13,4) and a local minimum at (5,8)(5,-8).

Schematic display of the stated feature points for $f$ and $g$; the curves are illustrative and are not intended to show exact pointwise correspondence.
A
I.

Use the horizontal coordinates of the corresponding endpoints to find qq and aa.

[2]
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II.

Use the vertical coordinates of the endpoints to find pp and bb.

[2]
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B

Verify that the local maximum of ff maps to the stated local minimum of gg.

[2]
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C

Given that g(7)=2g(7)=-2, determine f(3)f(3).

[2]
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Question 47
HL • Paper 3
Hard
Calculator Permitted

For f(x)=exf(x)=e^x, consider the family of transformed functions
g(x)=pf(q(xa))+bg(x)=p f(q(x-a))+b
where p>0p>0 and q>0q>0. A curve-fitting program reports p=6p=6, q=0.4q=0.4, a=3a=3 and b=2b=-2.

Exponential curve with a horizontal asymptote and a marked reference point.
A

Simplify and identify key features.

I.

Write g(x)g(x) in the form Ce0.4x2Ce^{0.4x}-2 and find CC to three significant figures.

[2]
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II.

State the range of gg and the image of the parent point (1,e)(1,e).

[2]
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B

The program fixes q=0.4q=0.4 and b=2b=-2 but allows pp and aa to vary. Show that infinitely many pairs (p,a)(p,a) produce exactly the same curve.

[4]
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C

Find the value of pp that gives the same curve when a=0a=0, and explain why interpreting pp and aa separately would be unreliable.

[2]
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Question 48
HL • Paper 3
Hard
Calculator Permitted

Two vertical transformations act on a graph. Transformation SpS_p is a vertical stretch with non-zero scale multiplier pp, and transformation TbT_b is a vertical translation by bb units. A general point on the graph is (x,y)(x,y).

Two parallel transformation flowcharts, one applying a vertical stretch then a vertical translation and the other applying them in the reverse order.
A

Compare the two possible orders.

I.

Find the final vertical coordinate when SpS_p is applied before TbT_b.

[2]
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II.

Find the final vertical coordinate when TbT_b is applied before SpS_p.

[2]
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B

Determine the condition on pp and bb for SpS_p and TbT_b to commute.

[3]
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C

A vertical transformation is written V(y)=py+bV(y)=py+b. It is to be performed in the reverse order, translation first and then stretch, without changing the final graph.

I.

To obtain the same final result as applying SpS_p followed by TbT_b, determine the translation by cc that must be applied before SpS_p, for p0p\ne0.

[2]
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II.

Hence rewrite the transformation y3y+12y\mapsto-3y+12 as a translation followed by a vertical stretch and reflection.

[2]
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Properties of Functions