Answer
See below.
Work Step by Step
A function $f(x)$ is a polynomial function if it is in the form of$f(x)=a_nx^n+a_{nā1}x^{nā1}+...+a_1x+a_0$, where $a_n\ne0$ and $n$ is an integer. In this case the power is $n$.
hence here it is a polynomial function with power of $5$
