## Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)

It is a polynomial function with a degree of $5$
A function $f(x)$ is a polynomial function when it has the form of $$f(x)=a_nx^n+a_{n−1}x^{n−1}++a_1x+a_0$$ where $a_n\ne0$ and $n$ is an integer. The given function has the correct form and $n=5$. Thus, it is a polynomial function with a degree of $5$.