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What are the factors of 4x2-11x-20?

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Anonymous

∙ 16y ago
Updated: 8/17/2019

4x2-11x-20=(x-4)(4x+5) 4x2-11x-20=4x2+ax+bx-20


ab = 4*-20 = -80
a+b = -11
a = -16, b = 5


4x2-11x-20=4x2-16x+5x-20
4x2-16x+5x-20=4x(x-4)+5(x-4)
4x(x-4)+5(x-4)=(x-4)(4x+5)

Factorised, 4x2-11x-20=(x-4)(4x+5)

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∙ 16y ago
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