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1. $x^{2} - y^{2} + 2 x + 1$

Answer: Option D

Explanation:

x^{2} - y^{2} + 2 x + 1 = x^{2} + 2 . x . 1 + 1^{2} - y^{2} = {(x + 1)}^{2} - y^{2} = (x + 1 + y) (x + 1 - y) = (x + y + 1) (x - y + 1) ∴ x^{2} - y^{2} + 2 x + 1 এর একটি উৎপাদক হচ্ছে (x + y + 1) এবং অপরটি হচ্ছে (x - y + 1)

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