Answer
To form f[g(x)],
in the expression defining f(x), $\bf{ \text{ replace } x \text{ with }g(x).}$
(sample answer)
Work Step by Step
To form f[g(x)],
in the expression defining f(x), $\bf{ \text{ replace } x \text{ with }g(x).}$
For example, if
$f(x)=x+1, \quad g(x)=\sqrt{x},$
then
$f[g(x)]\quad =g(x)+1\quad =\sqrt{x}+1$
$g[f(x)]\quad =\sqrt{f(x)}\quad =\sqrt{x+1}$
