Factor x^2-121

$x^{2} - 121$

Step 1

Rewrite $121$ as $11^{2}$ .

$x^{2} - 11^{2}$

Step 2

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = x$ and $b = 11$ .

$(x + 11) (x - 11)$