x^4-8x^2-12=0

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Solution for x^4-8x^2-12=0 equation:


Simplifying
x4 + -8x2 + -12 = 0

Reorder the terms:
-12 + -8x2 + x4 = 0

Solving
-12 + -8x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -8x2 + 12 + x4 = 0 + 12

Reorder the terms:
-12 + 12 + -8x2 + x4 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -8x2 + x4 = 0 + 12
-8x2 + x4 = 0 + 12

Combine like terms: 0 + 12 = 12
-8x2 + x4 = 12

The x term is -8x2.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x2 + 16 + x4 = 12 + 16

Reorder the terms:
16 + -8x2 + x4 = 12 + 16

Combine like terms: 12 + 16 = 28
16 + -8x2 + x4 = 28

Factor a perfect square on the left side:
(x2 + -4)(x2 + -4) = 28

Calculate the square root of the right side: 5.291502622

Break this problem into two subproblems by setting 
(x2 + -4) equal to 5.291502622 and -5.291502622.

Subproblem 1

x2 + -4 = 5.291502622 Simplifying x2 + -4 = 5.291502622 Reorder the terms: -4 + x2 = 5.291502622 Solving -4 + x2 = 5.291502622 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x2 = 5.291502622 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = 5.291502622 + 4 x2 = 5.291502622 + 4 Combine like terms: 5.291502622 + 4 = 9.291502622 x2 = 9.291502622 Simplifying x2 = 9.291502622 Take the square root of each side: x = {-3.048196618, 3.048196618}

Subproblem 2

x2 + -4 = -5.291502622 Simplifying x2 + -4 = -5.291502622 Reorder the terms: -4 + x2 = -5.291502622 Solving -4 + x2 = -5.291502622 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x2 = -5.291502622 + 4 Combine like terms: -4 + 4 = 0 0 + x2 = -5.291502622 + 4 x2 = -5.291502622 + 4 Combine like terms: -5.291502622 + 4 = -1.291502622 x2 = -1.291502622 Simplifying x2 = -1.291502622 Reorder the terms: 1.291502622 + x2 = -1.291502622 + 1.291502622 Combine like terms: -1.291502622 + 1.291502622 = 0.000000000 1.291502622 + 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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