1.

The factors of a2 - 1 - 2x - x2  areA. (a - x + 1)(a - x - 1) B. (a + x - 1)(a - x + 1) C. (a + x + 1)(a - x - 1) D. none of these

Answer»

We have,

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

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

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

\(=(a-1-\text{x})(a+1+\text{x})\)

\([a^{2}-b^{2}=(a+b)(a-b)]\)

Thus, the factors of

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



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