x2 - y2 + 2y - 1 এর একটি উৎপাদক হলো -

A x + y - 1

B x + y + 1

C x - y - 1

D 1 - x - y

Solution

Correct Answer: Option A

x2 - y2 + 2y - 1
= x2 - (y2 - 2y + 1) 
= x2 - (y - 1)2
= (x + y - 1)(x - y + 1)

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