Answer
$-2x(x-2)(x+1)$
Work Step by Step
$2x^2+4x-2x^3=2x(x)+2x(2)-2x(x^2)=2x(x+2-x^2)=2x(-x^2+x+2)=-2x(x^2-x-2)=-2x(x-2)(x+1)$
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