Answer
$-3x^{3}-6x^{2}+24x$
Work Step by Step
$-3x(x^{2}+2x-8)=-3x(x^{2})-3x(2x)-3x(-8)=-3x^{1+2}-6x^{1+1}+24x=-3x^{3}-6x^{2}+24x$
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