x^4+36x^2+225=0

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Solution for x^4+36x^2+225=0 equation:


Simplifying
x4 + 36x2 + 225 = 0

Reorder the terms:
225 + 36x2 + x4 = 0

Solving
225 + 36x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-225' to each side of the equation.
225 + 36x2 + -225 + x4 = 0 + -225

Reorder the terms:
225 + -225 + 36x2 + x4 = 0 + -225

Combine like terms: 225 + -225 = 0
0 + 36x2 + x4 = 0 + -225
36x2 + x4 = 0 + -225

Combine like terms: 0 + -225 = -225
36x2 + x4 = -225

The x term is 36x2.  Take half its coefficient (18).
Square it (324) and add it to both sides.

Add '324' to each side of the equation.
36x2 + 324 + x4 = -225 + 324

Reorder the terms:
324 + 36x2 + x4 = -225 + 324

Combine like terms: -225 + 324 = 99
324 + 36x2 + x4 = 99

Factor a perfect square on the left side:
(x2 + 18)(x2 + 18) = 99

Calculate the square root of the right side: 9.949874371

Break this problem into two subproblems by setting 
(x2 + 18) equal to 9.949874371 and -9.949874371.

Subproblem 1

x2 + 18 = 9.949874371 Simplifying x2 + 18 = 9.949874371 Reorder the terms: 18 + x2 = 9.949874371 Solving 18 + x2 = 9.949874371 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + x2 = 9.949874371 + -18 Combine like terms: 18 + -18 = 0 0 + x2 = 9.949874371 + -18 x2 = 9.949874371 + -18 Combine like terms: 9.949874371 + -18 = -8.050125629 x2 = -8.050125629 Simplifying x2 = -8.050125629 Reorder the terms: 8.050125629 + x2 = -8.050125629 + 8.050125629 Combine like terms: -8.050125629 + 8.050125629 = 0.000000000 8.050125629 + 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 + 18 = -9.949874371 Simplifying x2 + 18 = -9.949874371 Reorder the terms: 18 + x2 = -9.949874371 Solving 18 + x2 = -9.949874371 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + x2 = -9.949874371 + -18 Combine like terms: 18 + -18 = 0 0 + x2 = -9.949874371 + -18 x2 = -9.949874371 + -18 Combine like terms: -9.949874371 + -18 = -27.949874371 x2 = -27.949874371 Simplifying x2 = -27.949874371 Reorder the terms: 27.949874371 + x2 = -27.949874371 + 27.949874371 Combine like terms: -27.949874371 + 27.949874371 = 0.000000000 27.949874371 + 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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