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, x≠−cb, where a, b, c∈Z.
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.
Given that p=43, q=49 and A has coordinates (−12,0), determine the possible sets of values for a, b and c.
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(−12)+1=0⇒a=2 A1
from horizontal asymptote, (ab)2=49 (M1)
ab=±23⇒b=±3 A1
from vertical asymptote, b(43)+c=0
b = 3, c = −4 or b = −3, c = 4 A1
[4 marks]