3x^2-18=120

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Solution for 3x^2-18=120 equation: 


Simplifying
3x2 + -18 = 120

Reorder the terms:
-18 + 3x2 = 120

Solving
-18 + 3x2 = 120

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '18' to each side of the equation.
-18 + 18 + 3x2 = 120 + 18

Combine like terms: -18 + 18 = 0
0 + 3x2 = 120 + 18
3x2 = 120 + 18

Combine like terms: 120 + 18 = 138
3x2 = 138

Divide each side by '3'.
x2 = 46

Simplifying
x2 = 46

Take the square root of each side:
x = {-6.782329983, 6.782329983}

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