16x^6-8x^3-7=0

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Solution for 16x^6-8x^3-7=0 equation:


Simplifying
16x6 + -8x3 + -7 = 0

Reorder the terms:
-7 + -8x3 + 16x6 = 0

Solving
-7 + -8x3 + 16x6 = 0

Solving for variable 'x'.

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

Divide each side by '16'.
-0.4375 + -0.5x3 + x6 = 0

Move the constant term to the right:

Add '0.4375' to each side of the equation.
-0.4375 + -0.5x3 + 0.4375 + x6 = 0 + 0.4375

Reorder the terms:
-0.4375 + 0.4375 + -0.5x3 + x6 = 0 + 0.4375

Combine like terms: -0.4375 + 0.4375 = 0.0000
0.0000 + -0.5x3 + x6 = 0 + 0.4375
-0.5x3 + x6 = 0 + 0.4375

Combine like terms: 0 + 0.4375 = 0.4375
-0.5x3 + x6 = 0.4375

The x term is -0.5x3.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x3 + 0.0625 + x6 = 0.4375 + 0.0625

Reorder the terms:
0.0625 + -0.5x3 + x6 = 0.4375 + 0.0625

Combine like terms: 0.4375 + 0.0625 = 0.5
0.0625 + -0.5x3 + x6 = 0.5

Factor a perfect square on the left side:
(x3 + -0.25)(x3 + -0.25) = 0.5

Calculate the square root of the right side: 0.707106781

Break this problem into two subproblems by setting 
(x3 + -0.25) equal to 0.707106781 and -0.707106781.

Subproblem 1

x3 + -0.25 = 0.707106781 Simplifying x3 + -0.25 = 0.707106781 Reorder the terms: -0.25 + x3 = 0.707106781 Solving -0.25 + x3 = 0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x3 = 0.707106781 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x3 = 0.707106781 + 0.25 x3 = 0.707106781 + 0.25 Combine like terms: 0.707106781 + 0.25 = 0.957106781 x3 = 0.957106781 Simplifying x3 = 0.957106781 Reorder the terms: -0.957106781 + x3 = 0.957106781 + -0.957106781 Combine like terms: 0.957106781 + -0.957106781 = 0.000000000 -0.957106781 + 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 + -0.25 = -0.707106781 Simplifying x3 + -0.25 = -0.707106781 Reorder the terms: -0.25 + x3 = -0.707106781 Solving -0.25 + x3 = -0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x3 = -0.707106781 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x3 = -0.707106781 + 0.25 x3 = -0.707106781 + 0.25 Combine like terms: -0.707106781 + 0.25 = -0.457106781 x3 = -0.457106781 Simplifying x3 = -0.457106781 Reorder the terms: 0.457106781 + x3 = -0.457106781 + 0.457106781 Combine like terms: -0.457106781 + 0.457106781 = 0.000000000 0.457106781 + 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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