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Factorize: 

x2 - 1 - 2a – a2.

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We have ,

\(=\text{x}^{2}-1-2a-a^{2}\)

Taking -1 as common from last three terms

Thus the factors of

\(\text{x}^{2}-1-2a-a^{2}are(\text{x}+1+a)(\text{x}-1-a)\)

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