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)=x2−10x+5x+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)=(2x−10)(x+1)−(x2−10x+5)1(x+1)2 M1
f′(x)=0⇒x2+2x−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.