Answer
$(3x-1)(x-2)(x+2)$
Work Step by Step
We factor using grouping:
$3x^{3}-x^{2}-12x+4=3x^{3}-12x-x^{2}+4=3x(x^{2}-4)-(x^{2}-4)=(3x-1)(x^{2}-4)=(3x-1)(x-2)(x+2)$
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