Answer
$(x+6)(x-6)$
Work Step by Step
The given expression is equivalent to $x^2-6^2$, which is a difference of two squares.
Factor using the formula for a difference of squares, which is $A^{2}-B^{2}=(A-B)(A+B)$, to obtain
$x^{2}-6^{2}=(x+6)(x-6)$
