x2- y2+2y-1 এর একটি উৎপাদক-

A x+y+1

B x-y

C x+y-1

D x-y-1

Solution

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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