Answer
$x=-5,-3$
Work Step by Step
Plug the values $a$, $b$, and $c$ into the quadratic formula and simplify all the values.
$x^2+8x+15=0$
$a=1,b=8,c=15$
$x=\frac{-b±\sqrt {b^2-4ac}}{2a}$
$x=\frac{-8±\sqrt {8^2-4(1)(15)}}{2(1)}$
$x=\frac{-8±\sqrt {64-60}}{2}$
$x=\frac{-8±\sqrt {4}}{2}$
$x=\frac{-8±2}{2}$
$x=-5,-3$
