Help Factoring Quadrinomial
I know factoring questions are a dime a dozen but I can't seem to get this
one.
$-2x^3+2x^2+32x+40$
Factor to obtain the following equation:
$-2(x-5)(x+2)^2$
Do I have to use division (I'd prefer not to)? The way the question is
worded, it seems I should just be able to pull factors out. This is the
farthest I could make it:
$-2(x^3-x^2-16x-20)$
$-2[x^2(x-1)-4(4x+5)]$
$-2[(x^2-4)(x-1)(4x+5)]$
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