4x^4-256=0

Solution for 4x^4-256=0 equation:

Simplifying
4x4 + -256 = 0

Reorder the terms:
-256 + 4x4 = 0

Solving
-256 + 4x4 = 0

Solving for variable 'x'.

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

Add '256' to each side of the equation.
-256 + 256 + 4x4 = 0 + 256

Combine like terms: -256 + 256 = 0
0 + 4x4 = 0 + 256
4x4 = 0 + 256

Combine like terms: 0 + 256 = 256
4x4 = 256

Divide each side by '4'.
x4 = 64

Simplifying
x4 = 64

Reorder the terms:
-64 + x4 = 64 + -64

Combine like terms: 64 + -64 = 0
-64 + x4 = 0

Factor a difference between two squares.
(8 + x2)(-8 + x2) = 0

Subproblem 1
Set the factor '(8 + x2)' equal to zero and attempt to solve:

Simplifying
8 + x2 = 0

Solving
8 + x2 = 0

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

Add '-8' to each side of the equation.
8 + -8 + x2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + x2 = 0 + -8
x2 = 0 + -8

Combine like terms: 0 + -8 = -8
x2 = -8

Simplifying
x2 = -8

The solution to this equation could not be determined.

This subproblem is being ignored because a solution could not be determined.
Subproblem 2
Set the factor '(-8 + x2)' equal to zero and attempt to solve:

Simplifying
-8 + x2 = 0

Solving
-8 + x2 = 0

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

Add '8' to each side of the equation.
-8 + 8 + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + x2 = 0 + 8
x2 = 0 + 8

Combine like terms: 0 + 8 = 8
x2 = 8

Simplifying
x2 = 8

Take the square root of each side:
x = {-2.828427125, 2.828427125}
Solution
x = {-2.828427125, 2.828427125}