2x^4+8x^2+5=0

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Solution for 2x^4+8x^2+5=0 equation:


Simplifying
2x4 + 8x2 + 5 = 0

Reorder the terms:
5 + 8x2 + 2x4 = 0

Solving
5 + 8x2 + 2x4 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
2.5 + 4x2 + x4 = 0

Move the constant term to the right:

Add '-2.5' to each side of the equation.
2.5 + 4x2 + -2.5 + x4 = 0 + -2.5

Reorder the terms:
2.5 + -2.5 + 4x2 + x4 = 0 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + 4x2 + x4 = 0 + -2.5
4x2 + x4 = 0 + -2.5

Combine like terms: 0 + -2.5 = -2.5
4x2 + x4 = -2.5

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 = -2.5 + 4

Reorder the terms:
4 + 4x2 + x4 = -2.5 + 4

Combine like terms: -2.5 + 4 = 1.5
4 + 4x2 + x4 = 1.5

Factor a perfect square on the left side:
(x2 + 2)(x2 + 2) = 1.5

Calculate the square root of the right side: 1.224744871

Break this problem into two subproblems by setting 
(x2 + 2) equal to 1.224744871 and -1.224744871.

Subproblem 1

x2 + 2 = 1.224744871 Simplifying x2 + 2 = 1.224744871 Reorder the terms: 2 + x2 = 1.224744871 Solving 2 + x2 = 1.224744871 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 = 1.224744871 + -2 Combine like terms: 2 + -2 = 0 0 + x2 = 1.224744871 + -2 x2 = 1.224744871 + -2 Combine like terms: 1.224744871 + -2 = -0.775255129 x2 = -0.775255129 Simplifying x2 = -0.775255129 Reorder the terms: 0.775255129 + x2 = -0.775255129 + 0.775255129 Combine like terms: -0.775255129 + 0.775255129 = 0.000000000 0.775255129 + x2 = 0.000000000 The solution to this equation could not be determined.This subproblem is being ignored because a solution could not be determined.

Subproblem 2

x2 + 2 = -1.224744871 Simplifying x2 + 2 = -1.224744871 Reorder the terms: 2 + x2 = -1.224744871 Solving 2 + x2 = -1.224744871 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 = -1.224744871 + -2 Combine like terms: 2 + -2 = 0 0 + x2 = -1.224744871 + -2 x2 = -1.224744871 + -2 Combine like terms: -1.224744871 + -2 = -3.224744871 x2 = -3.224744871 Simplifying x2 = -3.224744871 Reorder the terms: 3.224744871 + x2 = -3.224744871 + 3.224744871 Combine like terms: -3.224744871 + 3.224744871 = 0.000000000 3.224744871 + 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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