## Precalculus: Mathematics for Calculus, 7th Edition

$A^2$ - $B^2$ = (A + B)(A - B) $(x + 3)^2$ - 4 = (x + 3 + 2)(x + 3 - 2) (x + 3 + 2)(x + 3 - 2) = (x + 5)(x + 1)