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Date November 2021 Marks available 2 Reference code 21N.1.AHL.TZ0.10
Level Additional Higher Level Paper Paper 1 Time zone Time zone 0
Command term Draw Question number 10 Adapted from N/A

Question

The graph of y=f(x) is given on the following set of axes. The graph passes through the points (2, 6) and (0, 1), and has a horizontal asymptote at y=0.

Let g(x)=2f(x2)+4.

Find g(0).

[2]
a.

On the same set of axes draw the graph of y=g(x), showing any intercepts and asymptotes.

[2]
b.

Markscheme

g(0)=16              M1A1


[2 marks]

a.

y-asymptote y=4            A1

concave up decreasing curve and passing through (0, 16)            A1


[2 marks]

b.

Examiners report

This question was not particularly well done. Candidates often failed to apply the transformation of the function correctly and did not understand how to use the algebra of graphical transformations. Others applied the geometry of stretches and translations, often incorrectly. Even if the graph was drawn correctly, some candidates failed to follow the instruction to show the asymptote.

a.

This question was not particularly well done. Candidates often failed to apply the transformation of the function correctly and did not understand how to use the algebra of graphical transformations. Others applied the geometry of stretches and translations, often incorrectly. Even if the graph was drawn correctly, some candidates failed to follow the instruction to show the asymptote.

b.

Syllabus sections

Topic 2—Functions » SL 2.4—Key features of graphs, intersections using technology
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