Answer
$(x-y-6)(x+y-6)$
Work Step by Step
RECALL:
A difference of two squares can be factored using the formula:
$a^2-b^2=(a-b)(a+b)$
Factor the given difference of two squares using the formula above with $a=x-6$ and $b=y$ to obtain:
$=[(x-6)-y][(x-6)+y]
\\=(x-6-y)(x-6+y)
\\=(x-y-6)(x+y-6)$
