Question 48134
Solve:
{{{x^2-80 = 0}}} First add 80 to both sides of the equation.
{{{x^2 = 80}}} Now take the square root of both sides.
{{{x = sqrt(80)}}} or {{{x = -sqrt(80)}}} Simplify.

 {{{sqrt(80) = sqrt(5*16)}}}= {{{4sqrt(5)}}}
So:
{{{x = 4sqrt(5)}}} or {{{x = -4sqrt(5)}}}