Mathematics 0580 · IGCSE · Functions

Functions — practice question

For part (a), $f(x) = x^3$ and $g(x) = 5x + 2$.

(a(i))[1]

Find the expression for $gf(x)$.

(a(ii))[2]

Find $g^{-1}(x)$.

(b)[2]

Find the value of $a$ when $h(-2) = 21$.

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The result is $5x^{3}+2$.” …