## Precalculus (6th Edition) Blitzer

$g; \text{ }f(x)$
RECALL: The composition function $g \circ f$ is defined as: $(g \circ f)(x) = g(f(x))$ This means that all the $x's$ in $g$ have to be replaced with $f(x)$. Thus, the missing expressions in the given statement are: $g; \text{ }f(x)$