Answer
$$x\left(x+2\right)^2\left(x-3\right)$$
Work Step by Step
Factoring the expression, we find:
$$x\left(x^3+x^2-8x-12\right) \\ x\left(x+2\right)^2\left(x-3\right)$$
Note, each of these factors correspond to a zero of the function.
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