Answer
The two functions which compose the function $h\left( x \right)$ are $f\left( x \right)={{x}^{7}}$ and $g\left( x \right)=\left( 2x+3 \right)$.
Work Step by Step
It is known that the composition of the function means applying one function to the output of another function.
Composition is denoted by:
$\left( f\circ g \right)\left( x \right)=f\left( g\left( x \right) \right)$.
Let $g\left( x \right)$ be a function as $g\left( x \right)=\left( 2x+3 \right)$ .
Let another function $f\left( x \right)$ be $f\left( x \right)={{x}^{7}}$.
Now,
$\begin{align}
& \left( f\circ g \right)\left( x \right)=f\left( g\left( x \right) \right) \\
& =f\left( 2x+3 \right) \\
& ={{\left( 2x+3 \right)}^{7}}
\end{align}$
So, the function $h\left( x \right)$ is the composition of two functions $f\left( x \right)$ and $g\left( x \right)$.
