81x^2-4=

Solution for 81x^2-4= equation:

Simplifying
81x2 + -4 = 0

Reorder the terms:
-4 + 81x2 = 0

Solving
-4 + 81x2 = 0

Solving for variable 'x'.

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

Add '4' to each side of the equation.
-4 + 4 + 81x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 81x2 = 0 + 4
81x2 = 0 + 4

Combine like terms: 0 + 4 = 4
81x2 = 4

Divide each side by '81'.
x2 = 0.04938271605

Simplifying
x2 = 0.04938271605

Take the square root of each side:
x = {-0.222222222, 0.222222222}