Answer
$20x^{3}-24x^{2}-40x$
Work Step by Step
$4x(5x^{2}-6x-10)=(4x)(5x^{2})+(4x)(-6x)+(4x)(-10)=20x^{3}+(-24x^{2})+(-40x)=20x^{3}-24x^{2}-40x$
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