8x^6+99x^3=125

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Solution for 8x^6+99x^3=125 equation:


Simplifying
8x6 + 99x3 = 125

Reorder the terms:
99x3 + 8x6 = 125

Solving
99x3 + 8x6 = 125

Solving for variable 'x'.

Reorder the terms:
-125 + 99x3 + 8x6 = 125 + -125

Combine like terms: 125 + -125 = 0
-125 + 99x3 + 8x6 = 0

Begin completing the square.  Divide all terms by
8 the coefficient of the squared term: 

Divide each side by '8'.
-15.625 + 12.375x3 + x6 = 0

Move the constant term to the right:

Add '15.625' to each side of the equation.
-15.625 + 12.375x3 + 15.625 + x6 = 0 + 15.625

Reorder the terms:
-15.625 + 15.625 + 12.375x3 + x6 = 0 + 15.625

Combine like terms: -15.625 + 15.625 = 0.000
0.000 + 12.375x3 + x6 = 0 + 15.625
12.375x3 + x6 = 0 + 15.625

Combine like terms: 0 + 15.625 = 15.625
12.375x3 + x6 = 15.625

The x term is 12.375x3.  Take half its coefficient (6.1875).
Square it (38.28515625) and add it to both sides.

Add '38.28515625' to each side of the equation.
12.375x3 + 38.28515625 + x6 = 15.625 + 38.28515625

Reorder the terms:
38.28515625 + 12.375x3 + x6 = 15.625 + 38.28515625

Combine like terms: 15.625 + 38.28515625 = 53.91015625
38.28515625 + 12.375x3 + x6 = 53.91015625

Factor a perfect square on the left side:
(x3 + 6.1875)(x3 + 6.1875) = 53.91015625

Calculate the square root of the right side: 7.342353591

Break this problem into two subproblems by setting 
(x3 + 6.1875) equal to 7.342353591 and -7.342353591.

Subproblem 1

x3 + 6.1875 = 7.342353591 Simplifying x3 + 6.1875 = 7.342353591 Reorder the terms: 6.1875 + x3 = 7.342353591 Solving 6.1875 + x3 = 7.342353591 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.1875' to each side of the equation. 6.1875 + -6.1875 + x3 = 7.342353591 + -6.1875 Combine like terms: 6.1875 + -6.1875 = 0.0000 0.0000 + x3 = 7.342353591 + -6.1875 x3 = 7.342353591 + -6.1875 Combine like terms: 7.342353591 + -6.1875 = 1.154853591 x3 = 1.154853591 Simplifying x3 = 1.154853591 Reorder the terms: -1.154853591 + x3 = 1.154853591 + -1.154853591 Combine like terms: 1.154853591 + -1.154853591 = 0.000000000 -1.154853591 + 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 + 6.1875 = -7.342353591 Simplifying x3 + 6.1875 = -7.342353591 Reorder the terms: 6.1875 + x3 = -7.342353591 Solving 6.1875 + x3 = -7.342353591 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6.1875' to each side of the equation. 6.1875 + -6.1875 + x3 = -7.342353591 + -6.1875 Combine like terms: 6.1875 + -6.1875 = 0.0000 0.0000 + x3 = -7.342353591 + -6.1875 x3 = -7.342353591 + -6.1875 Combine like terms: -7.342353591 + -6.1875 = -13.529853591 x3 = -13.529853591 Simplifying x3 = -13.529853591 Reorder the terms: 13.529853591 + x3 = -13.529853591 + 13.529853591 Combine like terms: -13.529853591 + 13.529853591 = 0.000000000 13.529853591 + 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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