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factor -x^2-x+20
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(x - 5)(x+4)
-x^2-x+20 =-x^2-5x+4x+20 =-x(x+5)+4(x+5) (x+5)(-x+4)
@subetcha it's supposed to be (x-5)(-x+4)
nope (x+5)(-x+4) =-x^2+4x-5x+20 =-x^2-x+20 which is the question
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