নীচের কোনটি x2– y2 +2y – 1 -এর একটি উৎপাদক?

A x-y

B x+y+1

C x+y-1

D x-y-1

Solution

Correct Answer: Option C

x2– y2 +2y – 1

or, (x)2 – (y - 1)2

or, (x+y-1)(x-y+1)

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