0=81-2x^2

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


Simplifying
0 = 81 + -2x2

Solving
0 = 81 + -2x2

Solving for variable 'x'.

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

Add '2x2' to each side of the equation.
0 + 2x2 = 81 + -2x2 + 2x2
Remove the zero:
2x2 = 81 + -2x2 + 2x2

Combine like terms: -2x2 + 2x2 = 0
2x2 = 81 + 0
2x2 = 81

Divide each side by '2'.
x2 = 40.5

Simplifying
x2 = 40.5

Take the square root of each side:
x = {-6.363961031, 6.363961031}

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