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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