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Simplifying
3x2 + -8 = 81
Reorder the terms:
-8 + 3x2 = 81
Solving
-8 + 3x2 = 81
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '8' to each side of the equation.
-8 + 8 + 3x2 = 81 + 8
Combine like terms: -8 + 8 = 0
0 + 3x2 = 81 + 8
3x2 = 81 + 8
Combine like terms: 81 + 8 = 89
3x2 = 89
Divide each side by '3'.
x2 = 29.66666667
Simplifying
x2 = 29.66666667
Take the square root of each side:
x = {-5.446711546, 5.446711546}
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