## Intermediate Algebra for College Students (7th Edition)

$4x^2-25y^2$
Given: $(2x-5y)(2x+5y)$ Since, $a^2-b^2=(a-b)(a+b)$ Thus, $(2x-5y)(2x+5y)=(2x)^2-(5y)^2$ Hence, $=4x^2-25y^2$