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Simplifying
4x2 + -81 = 81
Reorder the terms:
-81 + 4x2 = 81
Solving
-81 + 4x2 = 81
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 + 4x2 = 81 + 81
Combine like terms: -81 + 81 = 0
0 + 4x2 = 81 + 81
4x2 = 81 + 81
Combine like terms: 81 + 81 = 162
4x2 = 162
Divide each side by '4'.
x2 = 40.5
Simplifying
x2 = 40.5
Take the square root of each side:
x = {-6.363961031, 6.363961031}
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