3(x^2+4)=120

Solution for 3(x^2+4)=120 equation:

Simplifying
3(x2 + 4) = 120

Reorder the terms:
3(4 + x2) = 120
(4 * 3 + x2 * 3) = 120
(12 + 3x2) = 120

Solving
12 + 3x2 = 120

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + 3x2 = 120 + -12

Combine like terms: 12 + -12 = 0
0 + 3x2 = 120 + -12
3x2 = 120 + -12

Combine like terms: 120 + -12 = 108
3x2 = 108

Divide each side by '3'.
x2 = 36

Simplifying
x2 = 36

Take the square root of each side:
x = {-6, 6}