64-81x^2=

Solution for 64-81x^2= equation:

Simplifying
64 + -81x2 = 0

Solving
64 + -81x2 = 0

Solving for variable 'x'.

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

Add '-64' to each side of the equation.
64 + -64 + -81x2 = 0 + -64

Combine like terms: 64 + -64 = 0
0 + -81x2 = 0 + -64
-81x2 = 0 + -64

Combine like terms: 0 + -64 = -64
-81x2 = -64

Divide each side by '-81'.
x2 = 0.7901234568

Simplifying
x2 = 0.7901234568

Take the square root of each side:
x = {-0.888888889, 0.888888889}