x2 - y2 + 2y - 1 এর একটি উৎপাদক -
A x+y+1
B x-y
C x+y-1
D x-y-1
Correct Answer: Option C
x2- y2 + 2y -1
= x2 - (y2 - 2y +1)
= x2- (y-1)2
= (x+y-1)(x-y+1)
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