Question

Solving polynomial equations by factoring

Solve: (a+1) (a-5)=7
Full explanation please, thanks

Answer 1

(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