x2+x - (a+1) (a+2)
x2+x - (a+1) (a+1+1)
x2+x - p (p+1) [ a+1=p ধরে]
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+1+1)
(x-a-1) (x+a+2)
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