x^4-12x^2-36=0

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Solution for x^4-12x^2-36=0 equation:


Simplifying
x4 + -12x2 + -36 = 0

Reorder the terms:
-36 + -12x2 + x4 = 0

Solving
-36 + -12x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + -12x2 + 36 + x4 = 0 + 36

Reorder the terms:
-36 + 36 + -12x2 + x4 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + -12x2 + x4 = 0 + 36
-12x2 + x4 = 0 + 36

Combine like terms: 0 + 36 = 36
-12x2 + x4 = 36

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 = 36 + 36

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

Combine like terms: 36 + 36 = 72
36 + -12x2 + x4 = 72

Factor a perfect square on the left side:
(x2 + -6)(x2 + -6) = 72

Calculate the square root of the right side: 8.485281374

Break this problem into two subproblems by setting 
(x2 + -6) equal to 8.485281374 and -8.485281374.

Subproblem 1

x2 + -6 = 8.485281374 Simplifying x2 + -6 = 8.485281374 Reorder the terms: -6 + x2 = 8.485281374 Solving -6 + x2 = 8.485281374 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 = 8.485281374 + 6 Combine like terms: -6 + 6 = 0 0 + x2 = 8.485281374 + 6 x2 = 8.485281374 + 6 Combine like terms: 8.485281374 + 6 = 14.485281374 x2 = 14.485281374 Simplifying x2 = 14.485281374 Take the square root of each side: x = {-3.805953412, 3.805953412}

Subproblem 2

x2 + -6 = -8.485281374 Simplifying x2 + -6 = -8.485281374 Reorder the terms: -6 + x2 = -8.485281374 Solving -6 + x2 = -8.485281374 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 = -8.485281374 + 6 Combine like terms: -6 + 6 = 0 0 + x2 = -8.485281374 + 6 x2 = -8.485281374 + 6 Combine like terms: -8.485281374 + 6 = -2.485281374 x2 = -2.485281374 Simplifying x2 = -2.485281374 Reorder the terms: 2.485281374 + x2 = -2.485281374 + 2.485281374 Combine like terms: -2.485281374 + 2.485281374 = 0.000000000 2.485281374 + 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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