81x^2-1=

Solution for 81x^2-1= equation:

Simplifying
81x2 + -1 = 0

Reorder the terms:
-1 + 81x2 = 0

Solving
-1 + 81x2 = 0

Solving for variable 'x'.

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

Add '1' to each side of the equation.
-1 + 1 + 81x2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 81x2 = 0 + 1
81x2 = 0 + 1

Combine like terms: 0 + 1 = 1
81x2 = 1

Divide each side by '81'.
x2 = 0.01234567901

Simplifying
x2 = 0.01234567901

Take the square root of each side:
x = {-0.111111111, 0.111111111}