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23-10-2016
Mathematics

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How do you factor the expression -y^2 9y - 20?

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apologiabiology apologiabiology

25-10-2016

undistribute -1
(-1)(y^2-9y+20)
what multiplies to 20 and adds to -9
-5 and -4
(-1)(x-5)(x-4) or
(5-x)(x-4) or
(x-5)(4+x)

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