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Simplifying
3x2 + -3 = 81
Reorder the terms:
-3 + 3x2 = 81
Solving
-3 + 3x2 = 81
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '3' to each side of the equation.
-3 + 3 + 3x2 = 81 + 3
Combine like terms: -3 + 3 = 0
0 + 3x2 = 81 + 3
3x2 = 81 + 3
Combine like terms: 81 + 3 = 84
3x2 = 84
Divide each side by '3'.
x2 = 28
Simplifying
x2 = 28
Take the square root of each side:
x = {-5.291502622, 5.291502622}
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