(9x*9x)-4=0

Solution for (9x*9x)-4=0 equation:

Simplifying
(9x * 9x) + -4 = 0

Reorder the terms for easier multiplication:
(9 * 9x * x) + -4 = 0

Multiply 9 * 9
(81x * x) + -4 = 0

Multiply x * x
(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}