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Simplifying
3x2 + -81 = 12
Reorder the terms:
-81 + 3x2 = 12
Solving
-81 + 3x2 = 12
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 + 3x2 = 12 + 81
Combine like terms: -81 + 81 = 0
0 + 3x2 = 12 + 81
3x2 = 12 + 81
Combine like terms: 12 + 81 = 93
3x2 = 93
Divide each side by '3'.
x2 = 31
Simplifying
x2 = 31
Take the square root of each side:
x = {-5.567764363, 5.567764363}
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