5x^4-3x^2-1=0

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Solution for 5x^4-3x^2-1=0 equation:


Simplifying
5x4 + -3x2 + -1 = 0

Reorder the terms:
-1 + -3x2 + 5x4 = 0

Solving
-1 + -3x2 + 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'.
-0.2 + -0.6x2 + x4 = 0

Move the constant term to the right:

Add '0.2' to each side of the equation.
-0.2 + -0.6x2 + 0.2 + x4 = 0 + 0.2

Reorder the terms:
-0.2 + 0.2 + -0.6x2 + x4 = 0 + 0.2

Combine like terms: -0.2 + 0.2 = 0.0
0.0 + -0.6x2 + x4 = 0 + 0.2
-0.6x2 + x4 = 0 + 0.2

Combine like terms: 0 + 0.2 = 0.2
-0.6x2 + x4 = 0.2

The x term is -0.6x2.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6x2 + 0.09 + x4 = 0.2 + 0.09

Reorder the terms:
0.09 + -0.6x2 + x4 = 0.2 + 0.09

Combine like terms: 0.2 + 0.09 = 0.29
0.09 + -0.6x2 + x4 = 0.29

Factor a perfect square on the left side:
(x2 + -0.3)(x2 + -0.3) = 0.29

Calculate the square root of the right side: 0.538516481

Break this problem into two subproblems by setting 
(x2 + -0.3) equal to 0.538516481 and -0.538516481.

Subproblem 1

x2 + -0.3 = 0.538516481 Simplifying x2 + -0.3 = 0.538516481 Reorder the terms: -0.3 + x2 = 0.538516481 Solving -0.3 + x2 = 0.538516481 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x2 = 0.538516481 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x2 = 0.538516481 + 0.3 x2 = 0.538516481 + 0.3 Combine like terms: 0.538516481 + 0.3 = 0.838516481 x2 = 0.838516481 Simplifying x2 = 0.838516481 Take the square root of each side: x = {-0.915705455, 0.915705455}

Subproblem 2

x2 + -0.3 = -0.538516481 Simplifying x2 + -0.3 = -0.538516481 Reorder the terms: -0.3 + x2 = -0.538516481 Solving -0.3 + x2 = -0.538516481 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + x2 = -0.538516481 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + x2 = -0.538516481 + 0.3 x2 = -0.538516481 + 0.3 Combine like terms: -0.538516481 + 0.3 = -0.238516481 x2 = -0.238516481 Simplifying x2 = -0.238516481 Reorder the terms: 0.238516481 + x2 = -0.238516481 + 0.238516481 Combine like terms: -0.238516481 + 0.238516481 = 0.000000000 0.238516481 + 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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