How do you solve x^2 + 8 = 28?

Jul 20, 2015

color(green)(x=+-2sqrt5

Explanation:

${x}^{2} + 8 = 28$
${x}^{2} = 28 - 8$

${x}^{2} = 20$
$x = \pm \sqrt{20}$

color(green)(x=+-2sqrt5