Answer
$(-2x+5)(x+4)$
Work Step by Step
$20-3x-2x^2$
$-2x^2-3x+20$
$-1*(2x^2+3x-20)$
$-1*(2x-5)(x+4)$
$(-1*2x-5*-1)(x+4)$
$(-2x+5)(x+4)$
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