x^4-4x^2-4=0

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Solution for x^4-4x^2-4=0 equation:


Simplifying
x4 + -4x2 + -4 = 0

Reorder the terms:
-4 + -4x2 + x4 = 0

Solving
-4 + -4x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -4x2 + 4 + x4 = 0 + 4

Reorder the terms:
-4 + 4 + -4x2 + x4 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -4x2 + x4 = 0 + 4
-4x2 + x4 = 0 + 4

Combine like terms: 0 + 4 = 4
-4x2 + x4 = 4

The x term is -4x2.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x2 + 4 + x4 = 4 + 4

Reorder the terms:
4 + -4x2 + x4 = 4 + 4

Combine like terms: 4 + 4 = 8
4 + -4x2 + x4 = 8

Factor a perfect square on the left side:
(x2 + -2)(x2 + -2) = 8

Calculate the square root of the right side: 2.828427125

Break this problem into two subproblems by setting 
(x2 + -2) equal to 2.828427125 and -2.828427125.

Subproblem 1

x2 + -2 = 2.828427125 Simplifying x2 + -2 = 2.828427125 Reorder the terms: -2 + x2 = 2.828427125 Solving -2 + x2 = 2.828427125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x2 = 2.828427125 + 2 Combine like terms: -2 + 2 = 0 0 + x2 = 2.828427125 + 2 x2 = 2.828427125 + 2 Combine like terms: 2.828427125 + 2 = 4.828427125 x2 = 4.828427125 Simplifying x2 = 4.828427125 Take the square root of each side: x = {-2.197368227, 2.197368227}

Subproblem 2

x2 + -2 = -2.828427125 Simplifying x2 + -2 = -2.828427125 Reorder the terms: -2 + x2 = -2.828427125 Solving -2 + x2 = -2.828427125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x2 = -2.828427125 + 2 Combine like terms: -2 + 2 = 0 0 + x2 = -2.828427125 + 2 x2 = -2.828427125 + 2 Combine like terms: -2.828427125 + 2 = -0.828427125 x2 = -0.828427125 Simplifying x2 = -0.828427125 Reorder the terms: 0.828427125 + x2 = -0.828427125 + 0.828427125 Combine like terms: -0.828427125 + 0.828427125 = 0.000000000 0.828427125 + x2 = 0.000000000 The solution to this equation could not be determined.This subproblem is being ignored because a solution could not be determined. The solution to this equation could not be determined.

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