3x^4-31x^2=28

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Solution for 3x^4-31x^2=28 equation:


Simplifying
3x4 + -31x2 = 28

Reorder the terms:
-31x2 + 3x4 = 28

Solving
-31x2 + 3x4 = 28

Solving for variable 'x'.

Reorder the terms:
-28 + -31x2 + 3x4 = 28 + -28

Combine like terms: 28 + -28 = 0
-28 + -31x2 + 3x4 = 0

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

Divide each side by '3'.
-9.333333333 + -10.33333333x2 + x4 = 0

Move the constant term to the right:

Add '9.333333333' to each side of the equation.
-9.333333333 + -10.33333333x2 + 9.333333333 + x4 = 0 + 9.333333333

Reorder the terms:
-9.333333333 + 9.333333333 + -10.33333333x2 + x4 = 0 + 9.333333333

Combine like terms: -9.333333333 + 9.333333333 = 0.000000000
0.000000000 + -10.33333333x2 + x4 = 0 + 9.333333333
-10.33333333x2 + x4 = 0 + 9.333333333

Combine like terms: 0 + 9.333333333 = 9.333333333
-10.33333333x2 + x4 = 9.333333333

The x term is -10.33333333x2.  Take half its coefficient (-5.166666665).
Square it (26.69444443) and add it to both sides.

Add '26.69444443' to each side of the equation.
-10.33333333x2 + 26.69444443 + x4 = 9.333333333 + 26.69444443

Reorder the terms:
26.69444443 + -10.33333333x2 + x4 = 9.333333333 + 26.69444443

Combine like terms: 9.333333333 + 26.69444443 = 36.027777763
26.69444443 + -10.33333333x2 + x4 = 36.027777763

Factor a perfect square on the left side:
(x2 + -5.166666665)(x2 + -5.166666665) = 36.027777763

Calculate the square root of the right side: 6.002314367

Break this problem into two subproblems by setting 
(x2 + -5.166666665) equal to 6.002314367 and -6.002314367.

Subproblem 1

x2 + -5.166666665 = 6.002314367 Simplifying x2 + -5.166666665 = 6.002314367 Reorder the terms: -5.166666665 + x2 = 6.002314367 Solving -5.166666665 + x2 = 6.002314367 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.166666665' to each side of the equation. -5.166666665 + 5.166666665 + x2 = 6.002314367 + 5.166666665 Combine like terms: -5.166666665 + 5.166666665 = 0.000000000 0.000000000 + x2 = 6.002314367 + 5.166666665 x2 = 6.002314367 + 5.166666665 Combine like terms: 6.002314367 + 5.166666665 = 11.168981032 x2 = 11.168981032 Simplifying x2 = 11.168981032 Take the square root of each side: x = {-3.342002548, 3.342002548}

Subproblem 2

x2 + -5.166666665 = -6.002314367 Simplifying x2 + -5.166666665 = -6.002314367 Reorder the terms: -5.166666665 + x2 = -6.002314367 Solving -5.166666665 + x2 = -6.002314367 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.166666665' to each side of the equation. -5.166666665 + 5.166666665 + x2 = -6.002314367 + 5.166666665 Combine like terms: -5.166666665 + 5.166666665 = 0.000000000 0.000000000 + x2 = -6.002314367 + 5.166666665 x2 = -6.002314367 + 5.166666665 Combine like terms: -6.002314367 + 5.166666665 = -0.835647702 x2 = -0.835647702 Simplifying x2 = -0.835647702 Reorder the terms: 0.835647702 + x2 = -0.835647702 + 0.835647702 Combine like terms: -0.835647702 + 0.835647702 = 0.000000000 0.835647702 + 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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