-3x^2+18+120=0

Solution for -3x^2+18+120=0 equation:

Simplifying
-3x2 + 18 + 120 = 0

Reorder the terms:
18 + 120 + -3x2 = 0

Combine like terms: 18 + 120 = 138
138 + -3x2 = 0

Solving
138 + -3x2 = 0

Solving for variable 'x'.

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

Add '-138' to each side of the equation.
138 + -138 + -3x2 = 0 + -138

Combine like terms: 138 + -138 = 0
0 + -3x2 = 0 + -138
-3x2 = 0 + -138

Combine like terms: 0 + -138 = -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}