x^2 - 1 - 2a - a^2 factories
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Step-by-step explanation:
Given equation is x^2-1-2a-a^2
= x^2-(1+2a+a^2)
= x^2-(1+a)^2
= [x+(1+a)][x+(1-a)]
= (x+1+a)(x+1-a)
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