x² - y² + 2y - 1 এর একটি উৎপাদক x+y-1 হলে, অপর উৎপাদক কত?

A x + y + 1

B x - y + 1

C x - y - 1

D x - y

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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