0=4-81x^2

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Solution for 0=4-81x^2 equation: 


Simplifying
0 = 4 + -81x2

Solving
0 = 4 + -81x2

Solving for variable 'x'.

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

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

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

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