81=80x^2

Solution for 81=80x^2 equation:

Simplifying
81 = 80x2

Solving
81 = 80x2

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-80x2' to each side of the equation.
81 + -80x2 = 80x2 + -80x2

Combine like terms: 80x2 + -80x2 = 0
81 + -80x2 = 0

Add '-81' to each side of the equation.
81 + -81 + -80x2 = 0 + -81

Combine like terms: 81 + -81 = 0
0 + -80x2 = 0 + -81
-80x2 = 0 + -81

Combine like terms: 0 + -81 = -81
-80x2 = -81

Divide each side by '-80'.
x2 = 1.0125

Simplifying
x2 = 1.0125

Take the square root of each side:
x = {-1.00623059, 1.00623059}