x^4+6x^2-8=0

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Solution for x^4+6x^2-8=0 equation:


Simplifying
x4 + 6x2 + -8 = 0

Reorder the terms:
-8 + 6x2 + x4 = 0

Solving
-8 + 6x2 + x4 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + 6x2 + 8 + x4 = 0 + 8

Reorder the terms:
-8 + 8 + 6x2 + x4 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + 6x2 + x4 = 0 + 8
6x2 + x4 = 0 + 8

Combine like terms: 0 + 8 = 8
6x2 + x4 = 8

The x term is 6x2.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x2 + 9 + x4 = 8 + 9

Reorder the terms:
9 + 6x2 + x4 = 8 + 9

Combine like terms: 8 + 9 = 17
9 + 6x2 + x4 = 17

Factor a perfect square on the left side:
(x2 + 3)(x2 + 3) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(x2 + 3) equal to 4.123105626 and -4.123105626.

Subproblem 1

x2 + 3 = 4.123105626 Simplifying x2 + 3 = 4.123105626 Reorder the terms: 3 + x2 = 4.123105626 Solving 3 + x2 = 4.123105626 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x2 = 4.123105626 + -3 Combine like terms: 3 + -3 = 0 0 + x2 = 4.123105626 + -3 x2 = 4.123105626 + -3 Combine like terms: 4.123105626 + -3 = 1.123105626 x2 = 1.123105626 Simplifying x2 = 1.123105626 Take the square root of each side: x = {-1.059766779, 1.059766779}

Subproblem 2

x2 + 3 = -4.123105626 Simplifying x2 + 3 = -4.123105626 Reorder the terms: 3 + x2 = -4.123105626 Solving 3 + x2 = -4.123105626 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x2 = -4.123105626 + -3 Combine like terms: 3 + -3 = 0 0 + x2 = -4.123105626 + -3 x2 = -4.123105626 + -3 Combine like terms: -4.123105626 + -3 = -7.123105626 x2 = -7.123105626 Simplifying x2 = -7.123105626 Reorder the terms: 7.123105626 + x2 = -7.123105626 + 7.123105626 Combine like terms: -7.123105626 + 7.123105626 = 0.000000000 7.123105626 + 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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