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Simplifying
3x2 + -15 = 81
Reorder the terms:
-15 + 3x2 = 81
Solving
-15 + 3x2 = 81
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '15' to each side of the equation.
-15 + 15 + 3x2 = 81 + 15
Combine like terms: -15 + 15 = 0
0 + 3x2 = 81 + 15
3x2 = 81 + 15
Combine like terms: 81 + 15 = 96
3x2 = 96
Divide each side by '3'.
x2 = 32
Simplifying
x2 = 32
Take the square root of each side:
x = {-5.656854249, 5.656854249}
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