x^4+4x^2-16=0

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Solution for x^4+4x^2-16=0 equation:


Simplifying
x4 + 4x2 + -16 = 0

Reorder the terms:
-16 + 4x2 + x4 = 0

Solving
-16 + 4x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 4x2 + 16 + x4 = 0 + 16

Reorder the terms:
-16 + 16 + 4x2 + x4 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 4x2 + x4 = 0 + 16
4x2 + x4 = 0 + 16

Combine like terms: 0 + 16 = 16
4x2 + x4 = 16

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 = 16 + 4

Reorder the terms:
4 + 4x2 + x4 = 16 + 4

Combine like terms: 16 + 4 = 20
4 + 4x2 + x4 = 20

Factor a perfect square on the left side:
(x2 + 2)(x2 + 2) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
(x2 + 2) equal to 4.472135955 and -4.472135955.

Subproblem 1

x2 + 2 = 4.472135955 Simplifying x2 + 2 = 4.472135955 Reorder the terms: 2 + x2 = 4.472135955 Solving 2 + x2 = 4.472135955 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 = 4.472135955 + -2 Combine like terms: 2 + -2 = 0 0 + x2 = 4.472135955 + -2 x2 = 4.472135955 + -2 Combine like terms: 4.472135955 + -2 = 2.472135955 x2 = 2.472135955 Simplifying x2 = 2.472135955 Take the square root of each side: x = {-1.572302756, 1.572302756}

Subproblem 2

x2 + 2 = -4.472135955 Simplifying x2 + 2 = -4.472135955 Reorder the terms: 2 + x2 = -4.472135955 Solving 2 + x2 = -4.472135955 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 = -4.472135955 + -2 Combine like terms: 2 + -2 = 0 0 + x2 = -4.472135955 + -2 x2 = -4.472135955 + -2 Combine like terms: -4.472135955 + -2 = -6.472135955 x2 = -6.472135955 Simplifying x2 = -6.472135955 Reorder the terms: 6.472135955 + x2 = -6.472135955 + 6.472135955 Combine like terms: -6.472135955 + 6.472135955 = 0.000000000 6.472135955 + 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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