Factorize:
x2 - 1 - 2a - a2
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Given,
⇒ x2 - 1 - 2a - a2
⇒ x2 - (a2 + 2a + 1)
⇒ (x)2 - (a + 1)2
⇒ (x + a + 1)[x - (a + 1)]
⇒ (x + a + 1)(x - a - 1).
Hence, x2 - 1 - 2a - a2 = (x + a + 1)(x - a - 1).
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