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

$b+3$; $b-3$
RECALL: A difference of two squares can be factored using the formula $x^2-y^2=(x+y)(x-y)$ Factor using the formula above with $x=a$ and $y=b+3$ to obtain: $=[a+(b+3)][a-(b+3)] \\=(a+b+3)(a-b-3)$ Thus, the missing expressions in the given statement are: $b+3$; $b-3$