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

$5(x-3)(x+3)$
Given:$5x^2-45$ Take the common terms out. $=5(x^2-9)$ Since, $(a-b)(a+b)=a^2-b^2$ or, $=5(x^2-3^2)$ or, $=5(x-3)(x+3)$ Hence, $5(x-3)(x+3)$