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Date May Example questions Marks available 1 Reference code EXM.1.AHL.TZ0.6
Level Additional Higher Level Paper Paper 1 (without calculator) Time zone Time zone 0
Command term Write down Question number 6 Adapted from N/A

Question

Let  f ( x ) = x 2 10 x + 5 x + 1 , x R , x 1 .

Find the co-ordinates of all stationary points.

[4]
a.

Write down the equation of the vertical asymptote.

[1]
b.

With justification, state if each stationary point is a minimum, maximum or horizontal point of inflection.

[4]
c.

Markscheme

f ( x ) = ( 2 x 10 ) ( x + 1 ) ( x 2 10 x + 5 ) 1 ( x + 1 ) 2           M1

f ( x ) = 0 x 2 + 2 x 15 = 0 ( x + 5 ) ( x 3 ) = 0           M1

Stationary points are  ( 5 , 20 ) and ( 3 , 4 )          A1A1

[4 marks]

a.

x = 1         A1

[1 mark]

b.

Looking at the nature table

        M1A1

( 5 , 20 ) is a max and  ( 3 , 4 ) is a min         A1A1

[4 marks]

c.

Examiners report

[N/A]
a.
[N/A]
b.
[N/A]
c.

Syllabus sections

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

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