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Date May Example questions Marks available 4 Reference code EXM.1.AHL.TZ0.5
Level Additional Higher Level Paper Paper 1 (without calculator) Time zone Time zone 0
Command term Find Question number 5 Adapted from N/A

Question

Let  f ( x ) = 2 x 2 5 x 12 x + 2 , x R , x 2 .

Find all the intercepts of the graph of f ( x ) with both the x  and y  axes.

[4]
a.

Write down the equation of the vertical asymptote.

[1]
b.

As  x ±  the graph of  f ( x )  approaches an oblique straight line asymptote.

Divide  2 x 2 5 x 12 by  x + 2  to find the equation of this asymptote.

[4]
c.

Markscheme

x = 0 y = 6 intercept on the  y  axes is (0, −6)     A1

2 x 2 5 x 12 = 0 ( 2 x + 3 ) ( x 4 ) = 0 x = 3 2 or 4       M1

intercepts on the  x  axes are ( 3 2 , 0 ) and ( 4 , 0 )      A1A1

[4 marks]

a.

x = 2     A1

[1 mark]

b.

f ( x ) = 2 x 9 + 6 x + 2           M1A1

So equation of asymptote is y = 2 x 9           M1A1

[4 marks]

c.

Examiners report

[N/A]
a.
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b.
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c.

Syllabus sections

Topic 2—Functions » AHL 2.13—Rational functions
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Topic 2—Functions

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