3x^4-10x^2-108=0

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Solution for 3x^4-10x^2-108=0 equation:


Simplifying
3x4 + -10x2 + -108 = 0

Reorder the terms:
-108 + -10x2 + 3x4 = 0

Solving
-108 + -10x2 + 3x4 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-36 + -3.333333333x2 + x4 = 0

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + -3.333333333x2 + 36 + x4 = 0 + 36

Reorder the terms:
-36 + 36 + -3.333333333x2 + x4 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + -3.333333333x2 + x4 = 0 + 36
-3.333333333x2 + x4 = 0 + 36

Combine like terms: 0 + 36 = 36
-3.333333333x2 + x4 = 36

The x term is -3.333333333x2.  Take half its coefficient (-1.666666667).
Square it (2.777777779) and add it to both sides.

Add '2.777777779' to each side of the equation.
-3.333333333x2 + 2.777777779 + x4 = 36 + 2.777777779

Reorder the terms:
2.777777779 + -3.333333333x2 + x4 = 36 + 2.777777779

Combine like terms: 36 + 2.777777779 = 38.777777779
2.777777779 + -3.333333333x2 + x4 = 38.777777779

Factor a perfect square on the left side:
(x2 + -1.666666667)(x2 + -1.666666667) = 38.777777779

Calculate the square root of the right side: 6.227180564

Break this problem into two subproblems by setting 
(x2 + -1.666666667) equal to 6.227180564 and -6.227180564.

Subproblem 1

x2 + -1.666666667 = 6.227180564 Simplifying x2 + -1.666666667 = 6.227180564 Reorder the terms: -1.666666667 + x2 = 6.227180564 Solving -1.666666667 + x2 = 6.227180564 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + x2 = 6.227180564 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + x2 = 6.227180564 + 1.666666667 x2 = 6.227180564 + 1.666666667 Combine like terms: 6.227180564 + 1.666666667 = 7.893847231 x2 = 7.893847231 Simplifying x2 = 7.893847231 Take the square root of each side: x = {-2.809599123, 2.809599123}

Subproblem 2

x2 + -1.666666667 = -6.227180564 Simplifying x2 + -1.666666667 = -6.227180564 Reorder the terms: -1.666666667 + x2 = -6.227180564 Solving -1.666666667 + x2 = -6.227180564 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + x2 = -6.227180564 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + x2 = -6.227180564 + 1.666666667 x2 = -6.227180564 + 1.666666667 Combine like terms: -6.227180564 + 1.666666667 = -4.560513897 x2 = -4.560513897 Simplifying x2 = -4.560513897 Reorder the terms: 4.560513897 + x2 = -4.560513897 + 4.560513897 Combine like terms: -4.560513897 + 4.560513897 = 0.000000000 4.560513897 + x2 = 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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