2x^8+2x^4-1=0

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Solution for 2x^8+2x^4-1=0 equation:


Simplifying
2x8 + 2x4 + -1 = 0

Reorder the terms:
-1 + 2x4 + 2x8 = 0

Solving
-1 + 2x4 + 2x8 = 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'.
-0.5 + x4 + x8 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + x4 + 0.5 + x8 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + x4 + x8 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + x4 + x8 = 0 + 0.5
x4 + x8 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
x4 + x8 = 0.5

The x term is x4.  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.
 + 0.25 + x8 = 0.5 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x8 = 0.5 + 0.25

Combine like terms: 0.5 + 0.25 = 0.75
1.25 + x8 = 0.75

Factor a perfect square on the left side:
(x4 + 0.5)(x4 + 0.5) = 0.75

Calculate the square root of the right side: 0.866025404

Break this problem into two subproblems by setting 
(x4 + 0.5) equal to 0.866025404 and -0.866025404.

Subproblem 1

x4 + 0.5 = 0.866025404 Simplifying x4 + 0.5 = 0.866025404 Reorder the terms: 0.5 + x4 = 0.866025404 Solving 0.5 + x4 = 0.866025404 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 + x4 = 0.866025404 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x4 = 0.866025404 + -0.5 x4 = 0.866025404 + -0.5 Combine like terms: 0.866025404 + -0.5 = 0.366025404 x4 = 0.366025404 Simplifying x4 = 0.366025404 Reorder the terms: -0.366025404 + x4 = 0.366025404 + -0.366025404 Combine like terms: 0.366025404 + -0.366025404 = 0.000000000 -0.366025404 + x4 = 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

x4 + 0.5 = -0.866025404 Simplifying x4 + 0.5 = -0.866025404 Reorder the terms: 0.5 + x4 = -0.866025404 Solving 0.5 + x4 = -0.866025404 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 + x4 = -0.866025404 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x4 = -0.866025404 + -0.5 x4 = -0.866025404 + -0.5 Combine like terms: -0.866025404 + -0.5 = -1.366025404 x4 = -1.366025404 Simplifying x4 = -1.366025404 Reorder the terms: 1.366025404 + x4 = -1.366025404 + 1.366025404 Combine like terms: -1.366025404 + 1.366025404 = 0.000000000 1.366025404 + x4 = 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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