2x^4+9x^2+5=0

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Solution for 2x^4+9x^2+5=0 equation:


Simplifying
2x4 + 9x2 + 5 = 0

Reorder the terms:
5 + 9x2 + 2x4 = 0

Solving
5 + 9x2 + 2x4 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
2.5 + 4.5x2 + x4 = 0

Move the constant term to the right:

Add '-2.5' to each side of the equation.
2.5 + 4.5x2 + -2.5 + x4 = 0 + -2.5

Reorder the terms:
2.5 + -2.5 + 4.5x2 + x4 = 0 + -2.5

Combine like terms: 2.5 + -2.5 = 0.0
0.0 + 4.5x2 + x4 = 0 + -2.5
4.5x2 + x4 = 0 + -2.5

Combine like terms: 0 + -2.5 = -2.5
4.5x2 + x4 = -2.5

The x term is 4.5x2.  Take half its coefficient (2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
4.5x2 + 5.0625 + x4 = -2.5 + 5.0625

Reorder the terms:
5.0625 + 4.5x2 + x4 = -2.5 + 5.0625

Combine like terms: -2.5 + 5.0625 = 2.5625
5.0625 + 4.5x2 + x4 = 2.5625

Factor a perfect square on the left side:
(x2 + 2.25)(x2 + 2.25) = 2.5625

Calculate the square root of the right side: 1.600781059

Break this problem into two subproblems by setting 
(x2 + 2.25) equal to 1.600781059 and -1.600781059.

Subproblem 1

x2 + 2.25 = 1.600781059 Simplifying x2 + 2.25 = 1.600781059 Reorder the terms: 2.25 + x2 = 1.600781059 Solving 2.25 + x2 = 1.600781059 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + x2 = 1.600781059 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x2 = 1.600781059 + -2.25 x2 = 1.600781059 + -2.25 Combine like terms: 1.600781059 + -2.25 = -0.649218941 x2 = -0.649218941 Simplifying x2 = -0.649218941 Reorder the terms: 0.649218941 + x2 = -0.649218941 + 0.649218941 Combine like terms: -0.649218941 + 0.649218941 = 0.000000000 0.649218941 + x2 = 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

x2 + 2.25 = -1.600781059 Simplifying x2 + 2.25 = -1.600781059 Reorder the terms: 2.25 + x2 = -1.600781059 Solving 2.25 + x2 = -1.600781059 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + x2 = -1.600781059 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + x2 = -1.600781059 + -2.25 x2 = -1.600781059 + -2.25 Combine like terms: -1.600781059 + -2.25 = -3.850781059 x2 = -3.850781059 Simplifying x2 = -3.850781059 Reorder the terms: 3.850781059 + x2 = -3.850781059 + 3.850781059 Combine like terms: -3.850781059 + 3.850781059 = 0.000000000 3.850781059 + 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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