Answer
$$x^3-6x^2+5x+12$$
Work Step by Step
Starting with the factors in order to find the original polynomial function, we find:
$$\left(x+1\right)\left(x-3\right)\left(x-4\right) \\ \left(x^2-2x-3\right)\left(x-4\right) \\ x^3-6x^2+5x+12$$
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