Mathematics 0580 · IGCSE · Functions

Functions — practice question

The functions given are $f(x) = 3x + 5$ and $g(x) = x^2$.

(a)[1]

Find the value of $g(3x)$.

(b)[2]

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

(c)[2]

Calculate $ff(x)$. Write your answer in simplest form.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “ $9x^{2}$” …