Simplify 12x^3-6x^2-15

I am doing a review as a prep for precalculus. I don't remember how to simplify with exponents over 2.
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12x^3-6x^2-15 3(4x^3-2x^2-5) Sometimes you can factor within the brackets, but not in this case
by Level 6 User (23.6k points)

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