Date | November 2021 | Marks available | 1 | Reference code | 21N.1.AHL.TZ0.2 |
Level | Additional Higher Level | Paper | Paper 1 (without calculator) | Time zone | Time zone 0 |
Command term | Sketch | Question number | 2 | Adapted from | N/A |
Question
The function f is defined by f(x)=2x+43-x, where x∈ℝ, x≠3.
Write down the equation of
Find the coordinates where the graph of f crosses
the vertical asymptote of the graph of f.
the horizontal asymptote of the graph of f.
the x-axis.
the y-axis.
Sketch the graph of f on the axes below.
The function g is defined by g(x)=ax+43-x, where x∈ℝ, x≠3 and a∈ℝ.
Given that g(x)=g-1(x), determine the value of a.
Markscheme
x=3 A1
[1 mark]
y=-2 A1
[1 mark]
(-2, (accept ) A1
[1 mark]
(accept and ) A1
[1 mark]
A1
Note: Award A1 for completely correct shape: two branches in correct quadrants with asymptotic behaviour.
[1 mark]
METHOD 1
attempt to find in terms of (M1)
OR exchange and and attempt to find in terms of
A1
A1
Note: Condone use of
A1
METHOD 2
attempt to find an expression for and equate to (M1)
A1
A1
equating coefficients of (or similar)
A1
[4 marks]