Answer
$f(x)=(x+3)(x-0)(x-4)=x^3-x^2-12x.$
Work Step by Step
We are given that the degree is 3, and the zeros are -3, 0 and 4, hence a good function is: $f(x)=(x+3)(x-0)(x-4)=x^3-x^2-12x.$
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