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Simplifying
3x2 + -15 = 66
Reorder the terms:
-15 + 3x2 = 66
Solving
-15 + 3x2 = 66
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 = 66 + 15
Combine like terms: -15 + 15 = 0
0 + 3x2 = 66 + 15
3x2 = 66 + 15
Combine like terms: 66 + 15 = 81
3x2 = 81
Divide each side by '3'.
x2 = 27
Simplifying
x2 = 27
Take the square root of each side:
x = {-5.196152423, 5.196152423}
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