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)=2x2−5x−12x+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 2x2−5x−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
2x2−5x−12=0⇒(2x+3)(x−4)=0⇒x=−32or4 M1
intercepts on the x axes are (−32,0)and(4,0) A1A1
[4 marks]
a.
x=−2 A1
[1 mark]
b.
f(x)=2x−9+6x+2 M1A1
So equation of asymptote is y=2x−9 M1A1
[4 marks]
c.
Examiners report
[N/A]
a.
[N/A]
b.
[N/A]
c.