(a)[2]
Find the value of $gh(2)$.
(b)[2]
Find the inverse function $f^{-1}(x)$.
(c)[3]
For $gg(x) = ax^4 + bx^2 + c$, find the values of $a$, $b$ and $c$.
(d)[3]
Find $x$ for which $hf(x) = 81$.
Mathematics 0580 · IGCSE · Functions
Functions — practice question
The functions are $f(x) = 7x - 2$, $g(x) = x^2 + 1$, and $h(x) = 3^x$.