Mathematics 0580 · IGCSE · Functions

Functions — practice question

The functions are $f(x) = 5 - 2x$ $g(x) = x^2 + 8$
(a)[2]

Calculate the value of $ff(-3)$.

(b(i))[1]

Find the value of $g(2x)$.

(b(ii))[2]

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

Worked solution & mark scheme

This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The composition works out as $5-2(5-2x)$” …

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