x^6+8x^3-7=0

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Solution for x^6+8x^3-7=0 equation:


Simplifying
x6 + 8x3 + -7 = 0

Reorder the terms:
-7 + 8x3 + x6 = 0

Solving
-7 + 8x3 + x6 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 8x3 + 7 + x6 = 0 + 7

Reorder the terms:
-7 + 7 + 8x3 + x6 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 8x3 + x6 = 0 + 7
8x3 + x6 = 0 + 7

Combine like terms: 0 + 7 = 7
8x3 + x6 = 7

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 = 7 + 16

Reorder the terms:
16 + 8x3 + x6 = 7 + 16

Combine like terms: 7 + 16 = 23
16 + 8x3 + x6 = 23

Factor a perfect square on the left side:
(x3 + 4)(x3 + 4) = 23

Calculate the square root of the right side: 4.795831523

Break this problem into two subproblems by setting 
(x3 + 4) equal to 4.795831523 and -4.795831523.

Subproblem 1

x3 + 4 = 4.795831523 Simplifying x3 + 4 = 4.795831523 Reorder the terms: 4 + x3 = 4.795831523 Solving 4 + x3 = 4.795831523 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 = 4.795831523 + -4 Combine like terms: 4 + -4 = 0 0 + x3 = 4.795831523 + -4 x3 = 4.795831523 + -4 Combine like terms: 4.795831523 + -4 = 0.795831523 x3 = 0.795831523 Simplifying x3 = 0.795831523 Reorder the terms: -0.795831523 + x3 = 0.795831523 + -0.795831523 Combine like terms: 0.795831523 + -0.795831523 = 0.000000000 -0.795831523 + 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 = -4.795831523 Simplifying x3 + 4 = -4.795831523 Reorder the terms: 4 + x3 = -4.795831523 Solving 4 + x3 = -4.795831523 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 = -4.795831523 + -4 Combine like terms: 4 + -4 = 0 0 + x3 = -4.795831523 + -4 x3 = -4.795831523 + -4 Combine like terms: -4.795831523 + -4 = -8.795831523 x3 = -8.795831523 Simplifying x3 = -8.795831523 Reorder the terms: 8.795831523 + x3 = -8.795831523 + 8.795831523 Combine like terms: -8.795831523 + 8.795831523 = 0.000000000 8.795831523 + 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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