x*2x-4=256

Solution for x*2x-4=256 equation:

Simplifying
x * 2x + -4 = 256

Reorder the terms for easier multiplication:
2x * x + -4 = 256

Multiply x * x
2x2 + -4 = 256

Reorder the terms:
-4 + 2x2 = 256

Solving
-4 + 2x2 = 256

Solving for variable 'x'.

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

Add '4' to each side of the equation.
-4 + 4 + 2x2 = 256 + 4

Combine like terms: -4 + 4 = 0
0 + 2x2 = 256 + 4
2x2 = 256 + 4

Combine like terms: 256 + 4 = 260
2x2 = 260

Divide each side by '2'.
x2 = 130

Simplifying
x2 = 130

Take the square root of each side:
x = {-11.401754251, 11.401754251}