x2-y2+2y-1 এর একটি উৎপাদক কত?
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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