4x^4-8x^2-1=0

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Solution for 4x^4-8x^2-1=0 equation:


Simplifying
4x4 + -8x2 + -1 = 0

Reorder the terms:
-1 + -8x2 + 4x4 = 0

Solving
-1 + -8x2 + 4x4 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-0.25 + -2x2 + x4 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -2x2 + 0.25 + x4 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -2x2 + x4 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -2x2 + x4 = 0 + 0.25
-2x2 + x4 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-2x2 + x4 = 0.25

The x term is -2x2.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x2 + 1 + x4 = 0.25 + 1

Reorder the terms:
1 + -2x2 + x4 = 0.25 + 1

Combine like terms: 0.25 + 1 = 1.25
1 + -2x2 + x4 = 1.25

Factor a perfect square on the left side:
(x2 + -1)(x2 + -1) = 1.25

Calculate the square root of the right side: 1.118033989

Break this problem into two subproblems by setting 
(x2 + -1) equal to 1.118033989 and -1.118033989.

Subproblem 1

x2 + -1 = 1.118033989 Simplifying x2 + -1 = 1.118033989 Reorder the terms: -1 + x2 = 1.118033989 Solving -1 + x2 = 1.118033989 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x2 = 1.118033989 + 1 Combine like terms: -1 + 1 = 0 0 + x2 = 1.118033989 + 1 x2 = 1.118033989 + 1 Combine like terms: 1.118033989 + 1 = 2.118033989 x2 = 2.118033989 Simplifying x2 = 2.118033989 Take the square root of each side: x = {-1.45534669, 1.45534669}

Subproblem 2

x2 + -1 = -1.118033989 Simplifying x2 + -1 = -1.118033989 Reorder the terms: -1 + x2 = -1.118033989 Solving -1 + x2 = -1.118033989 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x2 = -1.118033989 + 1 Combine like terms: -1 + 1 = 0 0 + x2 = -1.118033989 + 1 x2 = -1.118033989 + 1 Combine like terms: -1.118033989 + 1 = -0.118033989 x2 = -0.118033989 Simplifying x2 = -0.118033989 Reorder the terms: 0.118033989 + x2 = -0.118033989 + 0.118033989 Combine like terms: -0.118033989 + 0.118033989 = 0.000000000 0.118033989 + 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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