Answer
$25g^2-4h^2$.
Work Step by Step
The given expression is
$=(-5g-2h)(-5g+2h)$
Factor out $-1$.
$=-1(5g+2h)(-5g+2h)$
Use distributive property.
$=(5g+2h)(5g-2h)$
Use sum and difference pattern $(a+b)(a-b)=a^2-b^2$.
We have $a=5g$ and $b=2h$.
$=(5g)^2-(2h)^2$
Simplify.
$=25g^2-4h^2$
Hence, the product is $25g^2-4h^2$.
