IGCSE Maths Edexcel A 4MA1

understand the concept that a function is a mapping between elements of two sets

**use function notations of the form $f(x) = ...$ and $f : x \mapsto ...$ **

understand the terms ‘domain’  and ‘range’  and which values may need to be excluded from a domain

$f(x) = \dfrac{1}{x-2}$ exclude $~x=2$

understand and find the composite function $fg$ and the inverse function $f^{-1}$

*‘$fg$’ will mean ‘do $g$ first, then $f$’ *