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

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


Simplifying
4x4 + x2 + -1 = 0

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

Solving
-1 + x2 + 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 + 0.25x2 + x4 = 0

Move the constant term to the right:

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

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

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

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

The x term is x2.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

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

Reorder the terms:
0.25 + 0.25x2 + x4 = 0.25 + 0.25

Combine like terms: 0.25 + 0.25 = 0.5
0.25 + 0.25x2 + x4 = 0.5

Factor a perfect square on the left side:
(x2 + 0.5)(x2 + 0.5) = 0.5

Calculate the square root of the right side: 0.707106781

Break this problem into two subproblems by setting 
(x2 + 0.5) equal to 0.707106781 and -0.707106781.

Subproblem 1

x2 + 0.5 = 0.707106781 Simplifying x2 + 0.5 = 0.707106781 Reorder the terms: 0.5 + x2 = 0.707106781 Solving 0.5 + x2 = 0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x2 = 0.707106781 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = 0.707106781 + -0.5 x2 = 0.707106781 + -0.5 Combine like terms: 0.707106781 + -0.5 = 0.207106781 x2 = 0.207106781 Simplifying x2 = 0.207106781 Take the square root of each side: x = {-0.45508986, 0.45508986}

Subproblem 2

x2 + 0.5 = -0.707106781 Simplifying x2 + 0.5 = -0.707106781 Reorder the terms: 0.5 + x2 = -0.707106781 Solving 0.5 + x2 = -0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x2 = -0.707106781 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x2 = -0.707106781 + -0.5 x2 = -0.707106781 + -0.5 Combine like terms: -0.707106781 + -0.5 = -1.207106781 x2 = -1.207106781 Simplifying x2 = -1.207106781 Reorder the terms: 1.207106781 + x2 = -1.207106781 + 1.207106781 Combine like terms: -1.207106781 + 1.207106781 = 0.000000000 1.207106781 + 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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