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

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


Simplifying
x6 + -8x3 + 8 = 0

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

Solving
8 + -8x3 + 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 + -8x3 + -8 + x6 = 0 + -8

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

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

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

The x term is -8x3.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x3 + 16 + x6 = -8 + 16

Reorder the terms:
16 + -8x3 + x6 = -8 + 16

Combine like terms: -8 + 16 = 8
16 + -8x3 + x6 = 8

Factor a perfect square on the left side:
(x3 + -4)(x3 + -4) = 8

Calculate the square root of the right side: 2.828427125

Break this problem into two subproblems by setting 
(x3 + -4) equal to 2.828427125 and -2.828427125.

Subproblem 1

x3 + -4 = 2.828427125 Simplifying x3 + -4 = 2.828427125 Reorder the terms: -4 + x3 = 2.828427125 Solving -4 + x3 = 2.828427125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x3 = 2.828427125 + 4 Combine like terms: -4 + 4 = 0 0 + x3 = 2.828427125 + 4 x3 = 2.828427125 + 4 Combine like terms: 2.828427125 + 4 = 6.828427125 x3 = 6.828427125 Simplifying x3 = 6.828427125 Reorder the terms: -6.828427125 + x3 = 6.828427125 + -6.828427125 Combine like terms: 6.828427125 + -6.828427125 = 0.000000000 -6.828427125 + 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 + -4 = -2.828427125 Simplifying x3 + -4 = -2.828427125 Reorder the terms: -4 + x3 = -2.828427125 Solving -4 + x3 = -2.828427125 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x3 = -2.828427125 + 4 Combine like terms: -4 + 4 = 0 0 + x3 = -2.828427125 + 4 x3 = -2.828427125 + 4 Combine like terms: -2.828427125 + 4 = 1.171572875 x3 = 1.171572875 Simplifying x3 = 1.171572875 Reorder the terms: -1.171572875 + x3 = 1.171572875 + -1.171572875 Combine like terms: 1.171572875 + -1.171572875 = 0.000000000 -1.171572875 + 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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