x^6-4x^3-8=0

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Solution for x^6-4x^3-8=0 equation:


Simplifying
x6 + -4x3 + -8 = 0

Reorder the terms:
-8 + -4x3 + x6 = 0

Solving
-8 + -4x3 + x6 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -4x3 + 8 + x6 = 0 + 8

Reorder the terms:
-8 + 8 + -4x3 + x6 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -4x3 + x6 = 0 + 8
-4x3 + x6 = 0 + 8

Combine like terms: 0 + 8 = 8
-4x3 + x6 = 8

The x term is -4x3.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x3 + 4 + x6 = 8 + 4

Reorder the terms:
4 + -4x3 + x6 = 8 + 4

Combine like terms: 8 + 4 = 12
4 + -4x3 + x6 = 12

Factor a perfect square on the left side:
(x3 + -2)(x3 + -2) = 12

Calculate the square root of the right side: 3.464101615

Break this problem into two subproblems by setting 
(x3 + -2) equal to 3.464101615 and -3.464101615.

Subproblem 1

x3 + -2 = 3.464101615 Simplifying x3 + -2 = 3.464101615 Reorder the terms: -2 + x3 = 3.464101615 Solving -2 + x3 = 3.464101615 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 + x3 = 3.464101615 + 2 Combine like terms: -2 + 2 = 0 0 + x3 = 3.464101615 + 2 x3 = 3.464101615 + 2 Combine like terms: 3.464101615 + 2 = 5.464101615 x3 = 5.464101615 Simplifying x3 = 5.464101615 Reorder the terms: -5.464101615 + x3 = 5.464101615 + -5.464101615 Combine like terms: 5.464101615 + -5.464101615 = 0.000000000 -5.464101615 + x3 = 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

x3 + -2 = -3.464101615 Simplifying x3 + -2 = -3.464101615 Reorder the terms: -2 + x3 = -3.464101615 Solving -2 + x3 = -3.464101615 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 + x3 = -3.464101615 + 2 Combine like terms: -2 + 2 = 0 0 + x3 = -3.464101615 + 2 x3 = -3.464101615 + 2 Combine like terms: -3.464101615 + 2 = -1.464101615 x3 = -1.464101615 Simplifying x3 = -1.464101615 Reorder the terms: 1.464101615 + x3 = -1.464101615 + 1.464101615 Combine like terms: -1.464101615 + 1.464101615 = 0.000000000 1.464101615 + x3 = 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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