x2 - y2 + 2y - 1 এর একটি উৎপাদক–

A x + y + 1

B x + y - 1

C x - y

D x - y - 1

Solution

Correct Answer: Option B

x2 - y2 + 2y - 1 

= x2 - ( y2 - 2y + 1 ) 

= x2 - ( y - 1 )2 

= ( x - y + 1 ) ( x + y - 1 )

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