Mathematics 4024 · O Level · Functions

Functions — practice question

The functions are $f(x)=ax+3$ and $g(x)=(x+b)^2$.

(a)[2]

Find the inverse function $f^{-1}(x)$.

(b)[3]

$gf(x)=9x^2+24x+16$. $a$ and $b$ are positive integers. Find the values of $a$ and $b$.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The inverse is $\frac{x-3}{a}$.” …