Elementary Algebra

$2x(x-6)(x+6)$
The two terms have $2x$ as a common factor. Factor out $2x$ to obtain: $=2x(x^2-36)$ RECALL: $a^2-b^2=(a-b)(a+b)$ Factor $x^2-36$ using the formula above to obtain: $=2x(x-6)(x+6)$