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13-02-2019
Mathematics

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Solving polynomial equations by factoring
Solve: (a+1) (a-5)=7
Full explanation please, thanks

Respuesta :

13-02-2019

(a+1)(a-5) = 7

expand

a² - 4a - 5 = 7

subtract by 7

a² - 4a - 12 = 0

factoring

(a+2)(a-6) = 0

a=-2 or a=6

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