Answer
$$\left(x+2\right)\left(x-2\right)^3$$
Work Step by Step
Factoring the expression, we find:
$$\left(x+2\right)\left(x-2\right)\left(x-2\right)\left(x-2\right) \\ \left(x+2\right)\left(x-2\right)^3$$
Note, each of these factors correspond to a zero of the function.