Answer
$(6x-7y)(6x+7y)$
Work Step by Step
The given expression can be written as
$(6x)^2-(7y)^2.$
The expression above is a difference of two squares.
RECALL:
$a^2-b^2=(a-b)(a+b).$
Factor the difference of two squares using the formula above with $a=6x$ and $b=7y$ to obtain
$(6x-7y)(6x+7y).$
