2x^4-8x^2-3=0

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Solution for 2x^4-8x^2-3=0 equation:


Simplifying
2x4 + -8x2 + -3 = 0

Reorder the terms:
-3 + -8x2 + 2x4 = 0

Solving
-3 + -8x2 + 2x4 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-1.5 + -4x2 + x4 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -4x2 + 1.5 + x4 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -4x2 + x4 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -4x2 + x4 = 0 + 1.5
-4x2 + x4 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-4x2 + x4 = 1.5

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 = 1.5 + 4

Reorder the terms:
4 + -4x2 + x4 = 1.5 + 4

Combine like terms: 1.5 + 4 = 5.5
4 + -4x2 + x4 = 5.5

Factor a perfect square on the left side:
(x2 + -2)(x2 + -2) = 5.5

Calculate the square root of the right side: 2.34520788

Break this problem into two subproblems by setting 
(x2 + -2) equal to 2.34520788 and -2.34520788.

Subproblem 1

x2 + -2 = 2.34520788 Simplifying x2 + -2 = 2.34520788 Reorder the terms: -2 + x2 = 2.34520788 Solving -2 + x2 = 2.34520788 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 = 2.34520788 + 2 Combine like terms: -2 + 2 = 0 0 + x2 = 2.34520788 + 2 x2 = 2.34520788 + 2 Combine like terms: 2.34520788 + 2 = 4.34520788 x2 = 4.34520788 Simplifying x2 = 4.34520788 Take the square root of each side: x = {-2.084516222, 2.084516222}

Subproblem 2

x2 + -2 = -2.34520788 Simplifying x2 + -2 = -2.34520788 Reorder the terms: -2 + x2 = -2.34520788 Solving -2 + x2 = -2.34520788 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 = -2.34520788 + 2 Combine like terms: -2 + 2 = 0 0 + x2 = -2.34520788 + 2 x2 = -2.34520788 + 2 Combine like terms: -2.34520788 + 2 = -0.34520788 x2 = -0.34520788 Simplifying x2 = -0.34520788 Reorder the terms: 0.34520788 + x2 = -0.34520788 + 0.34520788 Combine like terms: -0.34520788 + 0.34520788 = 0.00000000 0.34520788 + x2 = 0.00000000 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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