x^2+2x^2-144=0

Solution for x^2+2x^2-144=0 equation:

Simplifying
x2 + 2x2 + -144 = 0

Reorder the terms:
-144 + x2 + 2x2 = 0

Combine like terms: x2 + 2x2 = 3x2
-144 + 3x2 = 0

Solving
-144 + 3x2 = 0

Solving for variable 'x'.

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

Add '144' to each side of the equation.
-144 + 144 + 3x2 = 0 + 144

Combine like terms: -144 + 144 = 0
0 + 3x2 = 0 + 144
3x2 = 0 + 144

Combine like terms: 0 + 144 = 144
3x2 = 144

Divide each side by '3'.
x2 = 48

Simplifying
x2 = 48

Take the square root of each side:
x = {-6.92820323, 6.92820323}