5x^4+16x^2+4=0

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Solution for 5x^4+16x^2+4=0 equation:


Simplifying
5x4 + 16x2 + 4 = 0

Reorder the terms:
4 + 16x2 + 5x4 = 0

Solving
4 + 16x2 + 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'.
0.8 + 3.2x2 + x4 = 0

Move the constant term to the right:

Add '-0.8' to each side of the equation.
0.8 + 3.2x2 + -0.8 + x4 = 0 + -0.8

Reorder the terms:
0.8 + -0.8 + 3.2x2 + x4 = 0 + -0.8

Combine like terms: 0.8 + -0.8 = 0.0
0.0 + 3.2x2 + x4 = 0 + -0.8
3.2x2 + x4 = 0 + -0.8

Combine like terms: 0 + -0.8 = -0.8
3.2x2 + x4 = -0.8

The x term is 3.2x2.  Take half its coefficient (1.6).
Square it (2.56) and add it to both sides.

Add '2.56' to each side of the equation.
3.2x2 + 2.56 + x4 = -0.8 + 2.56

Reorder the terms:
2.56 + 3.2x2 + x4 = -0.8 + 2.56

Combine like terms: -0.8 + 2.56 = 1.76
2.56 + 3.2x2 + x4 = 1.76

Factor a perfect square on the left side:
(x2 + 1.6)(x2 + 1.6) = 1.76

Calculate the square root of the right side: 1.326649916

Break this problem into two subproblems by setting 
(x2 + 1.6) equal to 1.326649916 and -1.326649916.

Subproblem 1

x2 + 1.6 = 1.326649916 Simplifying x2 + 1.6 = 1.326649916 Reorder the terms: 1.6 + x2 = 1.326649916 Solving 1.6 + x2 = 1.326649916 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.6' to each side of the equation. 1.6 + -1.6 + x2 = 1.326649916 + -1.6 Combine like terms: 1.6 + -1.6 = 0.0 0.0 + x2 = 1.326649916 + -1.6 x2 = 1.326649916 + -1.6 Combine like terms: 1.326649916 + -1.6 = -0.273350084 x2 = -0.273350084 Simplifying x2 = -0.273350084 Reorder the terms: 0.273350084 + x2 = -0.273350084 + 0.273350084 Combine like terms: -0.273350084 + 0.273350084 = 0.000000000 0.273350084 + x2 = 0.000000000 The solution to this equation could not be determined.This subproblem is being ignored because a solution could not be determined.

Subproblem 2

x2 + 1.6 = -1.326649916 Simplifying x2 + 1.6 = -1.326649916 Reorder the terms: 1.6 + x2 = -1.326649916 Solving 1.6 + x2 = -1.326649916 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.6' to each side of the equation. 1.6 + -1.6 + x2 = -1.326649916 + -1.6 Combine like terms: 1.6 + -1.6 = 0.0 0.0 + x2 = -1.326649916 + -1.6 x2 = -1.326649916 + -1.6 Combine like terms: -1.326649916 + -1.6 = -2.926649916 x2 = -2.926649916 Simplifying x2 = -2.926649916 Reorder the terms: 2.926649916 + x2 = -2.926649916 + 2.926649916 Combine like terms: -2.926649916 + 2.926649916 = 0.000000000 2.926649916 + 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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