The amount of material needed to
construct a square wall with a square
window cut out can be represented by
400b^2-100a^2. Which expression is
equivalent to 400b^2100a^2?

F 100(2b-2a)²
G (20b - 10a)²
H (100b+25a)(100b - 25a)
J 100(2b+ a)(2b - a)