Answer
$(5x-4y)(5x+4y)$
Work Step by Step
RECALL:
A difference of two square can be factored using the formula
$a^2-b^2=(a-b)(a+b)$
The given binomial can be written as:
$=(5x)^2-(4y)^2$
The binomial above is a difference of two squares.
Factor the difference of two squares using the formula above with $a=5x$ and $b=4y$ to obtain:
$=(5x-4y)(5x+4y)$
