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