x^4-2x^2-5=0

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Solution for x^4-2x^2-5=0 equation:


Simplifying
x4 + -2x2 + -5 = 0

Reorder the terms:
-5 + -2x2 + x4 = 0

Solving
-5 + -2x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -2x2 + 5 + x4 = 0 + 5

Reorder the terms:
-5 + 5 + -2x2 + x4 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -2x2 + x4 = 0 + 5
-2x2 + x4 = 0 + 5

Combine like terms: 0 + 5 = 5
-2x2 + x4 = 5

The x term is -2x2.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x2 + 1 + x4 = 5 + 1

Reorder the terms:
1 + -2x2 + x4 = 5 + 1

Combine like terms: 5 + 1 = 6
1 + -2x2 + x4 = 6

Factor a perfect square on the left side:
(x2 + -1)(x2 + -1) = 6

Calculate the square root of the right side: 2.449489743

Break this problem into two subproblems by setting 
(x2 + -1) equal to 2.449489743 and -2.449489743.

Subproblem 1

x2 + -1 = 2.449489743 Simplifying x2 + -1 = 2.449489743 Reorder the terms: -1 + x2 = 2.449489743 Solving -1 + x2 = 2.449489743 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x2 = 2.449489743 + 1 Combine like terms: -1 + 1 = 0 0 + x2 = 2.449489743 + 1 x2 = 2.449489743 + 1 Combine like terms: 2.449489743 + 1 = 3.449489743 x2 = 3.449489743 Simplifying x2 = 3.449489743 Take the square root of each side: x = {-1.8572802, 1.8572802}

Subproblem 2

x2 + -1 = -2.449489743 Simplifying x2 + -1 = -2.449489743 Reorder the terms: -1 + x2 = -2.449489743 Solving -1 + x2 = -2.449489743 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x2 = -2.449489743 + 1 Combine like terms: -1 + 1 = 0 0 + x2 = -2.449489743 + 1 x2 = -2.449489743 + 1 Combine like terms: -2.449489743 + 1 = -1.449489743 x2 = -1.449489743 Simplifying x2 = -1.449489743 Reorder the terms: 1.449489743 + x2 = -1.449489743 + 1.449489743 Combine like terms: -1.449489743 + 1.449489743 = 0.000000000 1.449489743 + 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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