9x^4+31x^2-180=0

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Solution for 9x^4+31x^2-180=0 equation:


Simplifying
9x4 + 31x2 + -180 = 0

Reorder the terms:
-180 + 31x2 + 9x4 = 0

Solving
-180 + 31x2 + 9x4 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-20 + 3.444444444x2 + x4 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + 3.444444444x2 + 20 + x4 = 0 + 20

Reorder the terms:
-20 + 20 + 3.444444444x2 + x4 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 3.444444444x2 + x4 = 0 + 20
3.444444444x2 + x4 = 0 + 20

Combine like terms: 0 + 20 = 20
3.444444444x2 + x4 = 20

The x term is 3.444444444x2.  Take half its coefficient (1.722222222).
Square it (2.966049382) and add it to both sides.

Add '2.966049382' to each side of the equation.
3.444444444x2 + 2.966049382 + x4 = 20 + 2.966049382

Reorder the terms:
2.966049382 + 3.444444444x2 + x4 = 20 + 2.966049382

Combine like terms: 20 + 2.966049382 = 22.966049382
2.966049382 + 3.444444444x2 + x4 = 22.966049382

Factor a perfect square on the left side:
(x2 + 1.722222222)(x2 + 1.722222222) = 22.966049382

Calculate the square root of the right side: 4.79229062

Break this problem into two subproblems by setting 
(x2 + 1.722222222) equal to 4.79229062 and -4.79229062.

Subproblem 1

x2 + 1.722222222 = 4.79229062 Simplifying x2 + 1.722222222 = 4.79229062 Reorder the terms: 1.722222222 + x2 = 4.79229062 Solving 1.722222222 + x2 = 4.79229062 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.722222222' to each side of the equation. 1.722222222 + -1.722222222 + x2 = 4.79229062 + -1.722222222 Combine like terms: 1.722222222 + -1.722222222 = 0.000000000 0.000000000 + x2 = 4.79229062 + -1.722222222 x2 = 4.79229062 + -1.722222222 Combine like terms: 4.79229062 + -1.722222222 = 3.070068398 x2 = 3.070068398 Simplifying x2 = 3.070068398 Take the square root of each side: x = {-1.752161065, 1.752161065}

Subproblem 2

x2 + 1.722222222 = -4.79229062 Simplifying x2 + 1.722222222 = -4.79229062 Reorder the terms: 1.722222222 + x2 = -4.79229062 Solving 1.722222222 + x2 = -4.79229062 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.722222222' to each side of the equation. 1.722222222 + -1.722222222 + x2 = -4.79229062 + -1.722222222 Combine like terms: 1.722222222 + -1.722222222 = 0.000000000 0.000000000 + x2 = -4.79229062 + -1.722222222 x2 = -4.79229062 + -1.722222222 Combine like terms: -4.79229062 + -1.722222222 = -6.514512842 x2 = -6.514512842 Simplifying x2 = -6.514512842 Reorder the terms: 6.514512842 + x2 = -6.514512842 + 6.514512842 Combine like terms: -6.514512842 + 6.514512842 = 0.000000000 6.514512842 + 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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