Find f(g(x)) f(x)=2x g(x)=2x

$f (x) = 2 x$ $g (x) = 2 x$

Set up the composite result function.

$f (g (x))$

Evaluate $f (2 x)$ by substituting in the value of $g$ into $f$ .

$f (2 x) = 2 (2 x)$

Multiply $2$ by $2$ .

$f (2 x) = 4 x$