x^4+12x^2-16=0

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Solution for x^4+12x^2-16=0 equation:


Simplifying
x4 + 12x2 + -16 = 0

Reorder the terms:
-16 + 12x2 + x4 = 0

Solving
-16 + 12x2 + 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 + 12x2 + 16 + x4 = 0 + 16

Reorder the terms:
-16 + 16 + 12x2 + x4 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 12x2 + x4 = 0 + 16
12x2 + x4 = 0 + 16

Combine like terms: 0 + 16 = 16
12x2 + x4 = 16

The x term is 12x2.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x2 + 36 + x4 = 16 + 36

Reorder the terms:
36 + 12x2 + x4 = 16 + 36

Combine like terms: 16 + 36 = 52
36 + 12x2 + x4 = 52

Factor a perfect square on the left side:
(x2 + 6)(x2 + 6) = 52

Calculate the square root of the right side: 7.211102551

Break this problem into two subproblems by setting 
(x2 + 6) equal to 7.211102551 and -7.211102551.

Subproblem 1

x2 + 6 = 7.211102551 Simplifying x2 + 6 = 7.211102551 Reorder the terms: 6 + x2 = 7.211102551 Solving 6 + x2 = 7.211102551 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x2 = 7.211102551 + -6 Combine like terms: 6 + -6 = 0 0 + x2 = 7.211102551 + -6 x2 = 7.211102551 + -6 Combine like terms: 7.211102551 + -6 = 1.211102551 x2 = 1.211102551 Simplifying x2 = 1.211102551 Take the square root of each side: x = {-1.100501045, 1.100501045}

Subproblem 2

x2 + 6 = -7.211102551 Simplifying x2 + 6 = -7.211102551 Reorder the terms: 6 + x2 = -7.211102551 Solving 6 + x2 = -7.211102551 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x2 = -7.211102551 + -6 Combine like terms: 6 + -6 = 0 0 + x2 = -7.211102551 + -6 x2 = -7.211102551 + -6 Combine like terms: -7.211102551 + -6 = -13.211102551 x2 = -13.211102551 Simplifying x2 = -13.211102551 Reorder the terms: 13.211102551 + x2 = -13.211102551 + 13.211102551 Combine like terms: -13.211102551 + 13.211102551 = 0.000000000 13.211102551 + 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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