216x^6-81x^3+8=0

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Solution for 216x^6-81x^3+8=0 equation:


Simplifying
216x6 + -81x3 + 8 = 0

Reorder the terms:
8 + -81x3 + 216x6 = 0

Solving
8 + -81x3 + 216x6 = 0

Solving for variable 'x'.

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

Divide each side by '216'.
0.03703703704 + -0.375x3 + x6 = 0

Move the constant term to the right:

Add '-0.03703703704' to each side of the equation.
0.03703703704 + -0.375x3 + -0.03703703704 + x6 = 0 + -0.03703703704

Reorder the terms:
0.03703703704 + -0.03703703704 + -0.375x3 + x6 = 0 + -0.03703703704

Combine like terms: 0.03703703704 + -0.03703703704 = 0.00000000000
0.00000000000 + -0.375x3 + x6 = 0 + -0.03703703704
-0.375x3 + x6 = 0 + -0.03703703704

Combine like terms: 0 + -0.03703703704 = -0.03703703704
-0.375x3 + x6 = -0.03703703704

The x term is -0.375x3.  Take half its coefficient (-0.1875).
Square it (0.03515625) and add it to both sides.

Add '0.03515625' to each side of the equation.
-0.375x3 + 0.03515625 + x6 = -0.03703703704 + 0.03515625

Reorder the terms:
0.03515625 + -0.375x3 + x6 = -0.03703703704 + 0.03515625

Combine like terms: -0.03703703704 + 0.03515625 = -0.00188078704
0.03515625 + -0.375x3 + x6 = -0.00188078704

Factor a perfect square on the left side:
(x3 + -0.1875)(x3 + -0.1875) = -0.00188078704

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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