z^6-2z^3-4=0

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Solution for z^6-2z^3-4=0 equation:


Simplifying
z6 + -2z3 + -4 = 0

Reorder the terms:
-4 + -2z3 + z6 = 0

Solving
-4 + -2z3 + z6 = 0

Solving for variable 'z'.

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -2z3 + 4 + z6 = 0 + 4

Reorder the terms:
-4 + 4 + -2z3 + z6 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -2z3 + z6 = 0 + 4
-2z3 + z6 = 0 + 4

Combine like terms: 0 + 4 = 4
-2z3 + z6 = 4

The z term is -2z3.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2z3 + 1 + z6 = 4 + 1

Reorder the terms:
1 + -2z3 + z6 = 4 + 1

Combine like terms: 4 + 1 = 5
1 + -2z3 + z6 = 5

Factor a perfect square on the left side:
(z3 + -1)(z3 + -1) = 5

Calculate the square root of the right side: 2.236067978

Break this problem into two subproblems by setting 
(z3 + -1) equal to 2.236067978 and -2.236067978.

Subproblem 1

z3 + -1 = 2.236067978 Simplifying z3 + -1 = 2.236067978 Reorder the terms: -1 + z3 = 2.236067978 Solving -1 + z3 = 2.236067978 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + z3 = 2.236067978 + 1 Combine like terms: -1 + 1 = 0 0 + z3 = 2.236067978 + 1 z3 = 2.236067978 + 1 Combine like terms: 2.236067978 + 1 = 3.236067978 z3 = 3.236067978 Simplifying z3 = 3.236067978 Reorder the terms: -3.236067978 + z3 = 3.236067978 + -3.236067978 Combine like terms: 3.236067978 + -3.236067978 = 0.000000000 -3.236067978 + z3 = 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

z3 + -1 = -2.236067978 Simplifying z3 + -1 = -2.236067978 Reorder the terms: -1 + z3 = -2.236067978 Solving -1 + z3 = -2.236067978 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + z3 = -2.236067978 + 1 Combine like terms: -1 + 1 = 0 0 + z3 = -2.236067978 + 1 z3 = -2.236067978 + 1 Combine like terms: -2.236067978 + 1 = -1.236067978 z3 = -1.236067978 Simplifying z3 = -1.236067978 Reorder the terms: 1.236067978 + z3 = -1.236067978 + 1.236067978 Combine like terms: -1.236067978 + 1.236067978 = 0.000000000 1.236067978 + z3 = 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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