(a2+a)2 + 4(a2+a) – 12
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Step-by-step explanation:
(a²+a)²+4(a²+a)-12
let a²+a be x
x²+4x-12
x²+6x-2x-12
x(x+6)-2(x+6)
(x-2)(x+6)
now put x= a²+a
(a²+a-2)(a²+a+6)
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