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Date November 2018 Marks available 4 Reference code 18N.2.AHL.TZ0.H_8
Level Additional Higher Level Paper Paper 2 Time zone Time zone 0
Command term Determine Question number H_8 Adapted from N/A

Question

Consider the function f(x)=ax+1bx+c, xcb, where abcZ.

The following graph shows the curve y=(f(x))2. It has asymptotes at x=p and y=q and meets the x-axis at A.

On the following axes, sketch the two possible graphs of y=f(x) giving the equations of any asymptotes in terms of p and q.

[4]
a.

Given that p=43q=49 and A has coordinates (12,0), determine the possible sets of values for ab and c.

[4]
b.

Markscheme

* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure.

either graph passing through (or touching) A        A1

correct shape and vertical asymptote with correct equation for either graph       A1

correct horizontal asymptote with correct equation for either graph       A1

two completely correct sketches       A1

 

[4 marks]

a.

a(12)+1=0a=2      A1

from horizontal asymptote, (ab)2=49        (M1)

ab=±23b=±3       A1

from vertical asymptote, b(43)+c=0

b = 3, c = −4 or b = −3, c = 4     A1

 

[4 marks]

b.

Examiners report

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

Syllabus sections

Topic 2—Functions » SL 2.8—Reciprocal and simple rational functions, equations of asymptotes
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Topic 2—Functions

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