(a)[2]
From $f(-5k) = 675$, determine the value of $k$.
(b)[1]
Determine $gh(x)$.
(c)[4]
Find $h^{-1}(x) + j(x)$. Present your answer in its simplest form.
Mathematics 0580 · IGCSE · Functions
Functions — practice question
The functions are $f(x) = kx^2$, $g(x) = \frac{1}{x}$, $h(x) = \frac{7x - 2}{5}$ and $j(x) = \frac{3 - 10x}{14}$.