0=5x^4-2x^2-4

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Solution for 0=5x^4-2x^2-4 equation:


Simplifying
0 = 5x4 + -2x2 + -4

Reorder the terms:
0 = -4 + -2x2 + 5x4

Solving
0 = -4 + -2x2 + 5x4

Solving for variable 'x'.

Combine like terms: 0 + 4 = 4
4 + 2x2 + -5x4 = -4 + -2x2 + 5x4 + 4 + 2x2 + -5x4

Reorder the terms:
4 + 2x2 + -5x4 = -4 + 4 + -2x2 + 2x2 + 5x4 + -5x4

Combine like terms: -4 + 4 = 0
4 + 2x2 + -5x4 = 0 + -2x2 + 2x2 + 5x4 + -5x4
4 + 2x2 + -5x4 = -2x2 + 2x2 + 5x4 + -5x4

Combine like terms: -2x2 + 2x2 = 0
4 + 2x2 + -5x4 = 0 + 5x4 + -5x4
4 + 2x2 + -5x4 = 5x4 + -5x4

Combine like terms: 5x4 + -5x4 = 0
4 + 2x2 + -5x4 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-0.8 + -0.4x2 + x4 = 0

Move the constant term to the right:

Add '0.8' to each side of the equation.
-0.8 + -0.4x2 + 0.8 + x4 = 0 + 0.8

Reorder the terms:
-0.8 + 0.8 + -0.4x2 + x4 = 0 + 0.8

Combine like terms: -0.8 + 0.8 = 0.0
0.0 + -0.4x2 + x4 = 0 + 0.8
-0.4x2 + x4 = 0 + 0.8

Combine like terms: 0 + 0.8 = 0.8
-0.4x2 + x4 = 0.8

The x term is -0.4x2.  Take half its coefficient (-0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
-0.4x2 + 0.04 + x4 = 0.8 + 0.04

Reorder the terms:
0.04 + -0.4x2 + x4 = 0.8 + 0.04

Combine like terms: 0.8 + 0.04 = 0.84
0.04 + -0.4x2 + x4 = 0.84

Factor a perfect square on the left side:
(x2 + -0.2)(x2 + -0.2) = 0.84

Calculate the square root of the right side: 0.916515139

Break this problem into two subproblems by setting 
(x2 + -0.2) equal to 0.916515139 and -0.916515139.

Subproblem 1

x2 + -0.2 = 0.916515139 Simplifying x2 + -0.2 = 0.916515139 Reorder the terms: -0.2 + x2 = 0.916515139 Solving -0.2 + x2 = 0.916515139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x2 = 0.916515139 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x2 = 0.916515139 + 0.2 x2 = 0.916515139 + 0.2 Combine like terms: 0.916515139 + 0.2 = 1.116515139 x2 = 1.116515139 Simplifying x2 = 1.116515139 Take the square root of each side: x = {-1.0566528, 1.0566528}

Subproblem 2

x2 + -0.2 = -0.916515139 Simplifying x2 + -0.2 = -0.916515139 Reorder the terms: -0.2 + x2 = -0.916515139 Solving -0.2 + x2 = -0.916515139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2' to each side of the equation. -0.2 + 0.2 + x2 = -0.916515139 + 0.2 Combine like terms: -0.2 + 0.2 = 0.0 0.0 + x2 = -0.916515139 + 0.2 x2 = -0.916515139 + 0.2 Combine like terms: -0.916515139 + 0.2 = -0.716515139 x2 = -0.716515139 Simplifying x2 = -0.716515139 Reorder the terms: 0.716515139 + x2 = -0.716515139 + 0.716515139 Combine like terms: -0.716515139 + 0.716515139 = 0.000000000 0.716515139 + 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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