x^4+x^2-4=0

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


Simplifying
x4 + x2 + -4 = 0

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

Solving
-4 + x2 + 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 + x2 + 4 + x4 = 0 + 4

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

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

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

The x term is x2.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
x2 + 0.25 + x4 = 4 + 0.25

Reorder the terms:
0.25 + x2 + x4 = 4 + 0.25

Combine like terms: 4 + 0.25 = 4.25
0.25 + x2 + x4 = 4.25

Factor a perfect square on the left side:
(x2 + 0.5)(x2 + 0.5) = 4.25

Calculate the square root of the right side: 2.061552813

Break this problem into two subproblems by setting 
(x2 + 0.5) equal to 2.061552813 and -2.061552813.

Subproblem 1

x2 + 0.5 = 2.061552813 Simplifying x2 + 0.5 = 2.061552813 Reorder the terms: 0.5 + x2 = 2.061552813 Solving 0.5 + x2 = 2.061552813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x2 = 2.061552813 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = 2.061552813 + -0.5 x2 = 2.061552813 + -0.5 Combine like terms: 2.061552813 + -0.5 = 1.561552813 x2 = 1.561552813 Simplifying x2 = 1.561552813 Take the square root of each side: x = {-1.249621068, 1.249621068}

Subproblem 2

x2 + 0.5 = -2.061552813 Simplifying x2 + 0.5 = -2.061552813 Reorder the terms: 0.5 + x2 = -2.061552813 Solving 0.5 + x2 = -2.061552813 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x2 = -2.061552813 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = -2.061552813 + -0.5 x2 = -2.061552813 + -0.5 Combine like terms: -2.061552813 + -0.5 = -2.561552813 x2 = -2.561552813 Simplifying x2 = -2.561552813 Reorder the terms: 2.561552813 + x2 = -2.561552813 + 2.561552813 Combine like terms: -2.561552813 + 2.561552813 = 0.000000000 2.561552813 + 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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