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

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


Simplifying
x4 + 4x2 + -9 = 0

Reorder the terms:
-9 + 4x2 + x4 = 0

Solving
-9 + 4x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 4x2 + 9 + x4 = 0 + 9

Reorder the terms:
-9 + 9 + 4x2 + x4 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 4x2 + x4 = 0 + 9
4x2 + x4 = 0 + 9

Combine like terms: 0 + 9 = 9
4x2 + x4 = 9

The x term is 4x2.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x2 + 4 + x4 = 9 + 4

Reorder the terms:
4 + 4x2 + x4 = 9 + 4

Combine like terms: 9 + 4 = 13
4 + 4x2 + x4 = 13

Factor a perfect square on the left side:
(x2 + 2)(x2 + 2) = 13

Calculate the square root of the right side: 3.605551275

Break this problem into two subproblems by setting 
(x2 + 2) equal to 3.605551275 and -3.605551275.

Subproblem 1

x2 + 2 = 3.605551275 Simplifying x2 + 2 = 3.605551275 Reorder the terms: 2 + x2 = 3.605551275 Solving 2 + x2 = 3.605551275 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x2 = 3.605551275 + -2 Combine like terms: 2 + -2 = 0 0 + x2 = 3.605551275 + -2 x2 = 3.605551275 + -2 Combine like terms: 3.605551275 + -2 = 1.605551275 x2 = 1.605551275 Simplifying x2 = 1.605551275 Take the square root of each side: x = {-1.267103498, 1.267103498}

Subproblem 2

x2 + 2 = -3.605551275 Simplifying x2 + 2 = -3.605551275 Reorder the terms: 2 + x2 = -3.605551275 Solving 2 + x2 = -3.605551275 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x2 = -3.605551275 + -2 Combine like terms: 2 + -2 = 0 0 + x2 = -3.605551275 + -2 x2 = -3.605551275 + -2 Combine like terms: -3.605551275 + -2 = -5.605551275 x2 = -5.605551275 Simplifying x2 = -5.605551275 Reorder the terms: 5.605551275 + x2 = -5.605551275 + 5.605551275 Combine like terms: -5.605551275 + 5.605551275 = 0.000000000 5.605551275 + 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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