2x^4-x^2-56=0

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Solution for 2x^4-x^2-56=0 equation:


Simplifying
2x4 + -1x2 + -56 = 0

Reorder the terms:
-56 + -1x2 + 2x4 = 0

Solving
-56 + -1x2 + 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'.
-28 + -0.5x2 + x4 = 0

Move the constant term to the right:

Add '28' to each side of the equation.
-28 + -0.5x2 + 28 + x4 = 0 + 28

Reorder the terms:
-28 + 28 + -0.5x2 + x4 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + -0.5x2 + x4 = 0 + 28
-0.5x2 + x4 = 0 + 28

Combine like terms: 0 + 28 = 28
-0.5x2 + x4 = 28

The x term is -0.5x2.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5x2 + 0.0625 + x4 = 28 + 0.0625

Reorder the terms:
0.0625 + -0.5x2 + x4 = 28 + 0.0625

Combine like terms: 28 + 0.0625 = 28.0625
0.0625 + -0.5x2 + x4 = 28.0625

Factor a perfect square on the left side:
(x2 + -0.25)(x2 + -0.25) = 28.0625

Calculate the square root of the right side: 5.297405025

Break this problem into two subproblems by setting 
(x2 + -0.25) equal to 5.297405025 and -5.297405025.

Subproblem 1

x2 + -0.25 = 5.297405025 Simplifying x2 + -0.25 = 5.297405025 Reorder the terms: -0.25 + x2 = 5.297405025 Solving -0.25 + x2 = 5.297405025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x2 = 5.297405025 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x2 = 5.297405025 + 0.25 x2 = 5.297405025 + 0.25 Combine like terms: 5.297405025 + 0.25 = 5.547405025 x2 = 5.547405025 Simplifying x2 = 5.547405025 Take the square root of each side: x = {-2.355292981, 2.355292981}

Subproblem 2

x2 + -0.25 = -5.297405025 Simplifying x2 + -0.25 = -5.297405025 Reorder the terms: -0.25 + x2 = -5.297405025 Solving -0.25 + x2 = -5.297405025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + x2 = -5.297405025 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + x2 = -5.297405025 + 0.25 x2 = -5.297405025 + 0.25 Combine like terms: -5.297405025 + 0.25 = -5.047405025 x2 = -5.047405025 Simplifying x2 = -5.047405025 Reorder the terms: 5.047405025 + x2 = -5.047405025 + 5.047405025 Combine like terms: -5.047405025 + 5.047405025 = 0.000000000 5.047405025 + 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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