5x^4-2x^2-20x^2-8=

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Solution for 5x^4-2x^2-20x^2-8= equation:


Simplifying
5x4 + -2x2 + -20x2 + -8 = 0

Reorder the terms:
-8 + -2x2 + -20x2 + 5x4 = 0

Combine like terms: -2x2 + -20x2 = -22x2
-8 + -22x2 + 5x4 = 0

Solving
-8 + -22x2 + 5x4 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-1.6 + -4.4x2 + x4 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + -4.4x2 + 1.6 + x4 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + -4.4x2 + x4 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + -4.4x2 + x4 = 0 + 1.6
-4.4x2 + x4 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
-4.4x2 + x4 = 1.6

The x term is -4.4x2.  Take half its coefficient (-2.2).
Square it (4.84) and add it to both sides.

Add '4.84' to each side of the equation.
-4.4x2 + 4.84 + x4 = 1.6 + 4.84

Reorder the terms:
4.84 + -4.4x2 + x4 = 1.6 + 4.84

Combine like terms: 1.6 + 4.84 = 6.44
4.84 + -4.4x2 + x4 = 6.44

Factor a perfect square on the left side:
(x2 + -2.2)(x2 + -2.2) = 6.44

Calculate the square root of the right side: 2.537715508

Break this problem into two subproblems by setting 
(x2 + -2.2) equal to 2.537715508 and -2.537715508.

Subproblem 1

x2 + -2.2 = 2.537715508 Simplifying x2 + -2.2 = 2.537715508 Reorder the terms: -2.2 + x2 = 2.537715508 Solving -2.2 + x2 = 2.537715508 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.2' to each side of the equation. -2.2 + 2.2 + x2 = 2.537715508 + 2.2 Combine like terms: -2.2 + 2.2 = 0.0 0.0 + x2 = 2.537715508 + 2.2 x2 = 2.537715508 + 2.2 Combine like terms: 2.537715508 + 2.2 = 4.737715508 x2 = 4.737715508 Simplifying x2 = 4.737715508 Take the square root of each side: x = {-2.176629392, 2.176629392}

Subproblem 2

x2 + -2.2 = -2.537715508 Simplifying x2 + -2.2 = -2.537715508 Reorder the terms: -2.2 + x2 = -2.537715508 Solving -2.2 + x2 = -2.537715508 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.2' to each side of the equation. -2.2 + 2.2 + x2 = -2.537715508 + 2.2 Combine like terms: -2.2 + 2.2 = 0.0 0.0 + x2 = -2.537715508 + 2.2 x2 = -2.537715508 + 2.2 Combine like terms: -2.537715508 + 2.2 = -0.337715508 x2 = -0.337715508 Simplifying x2 = -0.337715508 Reorder the terms: 0.337715508 + x2 = -0.337715508 + 0.337715508 Combine like terms: -0.337715508 + 0.337715508 = 0.000000000 0.337715508 + 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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