# How do you solve the quadratic equation by completing the square: x^2-8x=9?

${x}^{2} - 8 x + 16 = 9 + 16 = 25$
${\left(x - 4\right)}^{2} = 25$
$\left(x - 4\right) = \pm 5$
$x = 4 \pm 5$--> $x = \left(- 1\right)$and $x = 9$