Question 110712
This is a difference of two squares problem.
:
{{{a^2-b^2=(a+b)(a-b)}}}
:
In this case, {{{a =sqrt(4x^2)= 2x}}} and {{{b=sqrt(36y^2)= 6y}}}, so we can write:
:
{{{(2x+6y)(2x-6y)}}}