Write the following difference of squares as a product of two binomials.
$81-G^2$

Write the following difference of squares as a product of two binomials.

$k^2-49$

Factor completely.

$x^2-40x+400$

Factor completely.

$4m^2+20m+25$

Factor completely. Hint: Factor out the GCF first.

$12x^2+48x+48$

Factor completely. Hint: Factor out the GCF first.

$-4y^3-24y^2-36y$