3x^2+40-128=0

Solution for 3x^2+40-128=0 equation:

Simplifying
3x2 + 40 + -128 = 0

Reorder the terms:
40 + -128 + 3x2 = 0

Combine like terms: 40 + -128 = -88
-88 + 3x2 = 0

Solving
-88 + 3x2 = 0

Solving for variable 'x'.

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

Add '88' to each side of the equation.
-88 + 88 + 3x2 = 0 + 88

Combine like terms: -88 + 88 = 0
0 + 3x2 = 0 + 88
3x2 = 0 + 88

Combine like terms: 0 + 88 = 88
3x2 = 88

Divide each side by '3'.
x2 = 29.33333333

Simplifying
x2 = 29.33333333

Take the square root of each side:
x = {-5.416025603, 5.416025603}