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

The given statement is the result of the Fundamental Theorem of Algebra and the Factor Theorem. The fundamental theorem of algebra states every non-constant single-variable polynomial with complex coefficients must attain at least a complex root. The factor theorem states that when $f(a)=0$, then we have $(x-a)$ as a factor of $f(x)$ and when $(x-a)$ is a factor of $f(x)$, then $f(a)=0$. Therefore, the given statement is True.