Question

the factors of $a^2-1-2x-x^2$ are

• A. (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 1

The correct option is C

(a +x +1) ( a- x - 1)

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