Answer
$f(x)=x^4$ and $g(x)=2x+3$
Work Step by Step
We wish to find two functions $f$ and $g$, such that:
$H(x)=(f \circ g)(x)=(2x+3)^4$
Let us consider:
$f(x)=x^4$ and $g(x)=2x+3$
Then we have the composite function:
$H(x)=(f \circ g)(x) =f[g(x)]=f(2x+3)=(2x+3)^4$
