3x+1x−1
3x2−1(x−1)2
x3x−21−x
3x2−1(x−1)
Correct answer is A
a2 - b2 = (2x1−x)2 - (1+x1−x)2
= (2x1−x+1+x1−x)(2x1−x−1+x1−X)
= (3x+11−x)(x−11−x)
= 3x+1x−1
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