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1. $1 - a^{2} + 2 a b - b^{2}$

A. $(1 + a + b) (1 - a + b)$
B. $(1 + a + b) (1 - a + b)$
C. $(1 + a + b) (1 - a + b)$
D. $(1 + a + b) (1 - a + b)$

Answer: Option D

Explanation:

1-a²+2ab-b²

=(a²-2ab+b²)-1

=(a-b)²-1²

=(1+a-b)(1-a+b)

(ans)

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