-81+100x^2=0

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Solution for -81+100x^2=0 equation: 


Simplifying
-81 + 100x2 = 0

Solving
-81 + 100x2 = 0

Solving for variable 'x'.

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

Add '81' to each side of the equation.
-81 + 81 + 100x2 = 0 + 81

Combine like terms: -81 + 81 = 0
0 + 100x2 = 0 + 81
100x2 = 0 + 81

Combine like terms: 0 + 81 = 81
100x2 = 81

Divide each side by '100'.
x2 = 0.81

Simplifying
x2 = 0.81

Take the square root of each side:
x = {-0.9, 0.9}

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