x2+x-(a+1) (a+2) =x2+x-(a+1) (a+1+1)
মনে করি, (a+1) = p
এখন, x2+x-p(p+1)
⇒x2+x-p2-p ⇒x2-p2+x-p ⇒(x+p) (x-p) + 1 (x-p) ⇒(x-p) (x+p+1) ⇒(x-a-1) (x+a+1+1) ⇒(x-a-1) (x+a+2)
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