18x^4-5x^2-4=0

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Solution for 18x^4-5x^2-4=0 equation:


Simplifying
18x4 + -5x2 + -4 = 0

Reorder the terms:
-4 + -5x2 + 18x4 = 0

Solving
-4 + -5x2 + 18x4 = 0

Solving for variable 'x'.

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

Divide each side by '18'.
-0.2222222222 + -0.2777777778x2 + x4 = 0

Move the constant term to the right:

Add '0.2222222222' to each side of the equation.
-0.2222222222 + -0.2777777778x2 + 0.2222222222 + x4 = 0 + 0.2222222222

Reorder the terms:
-0.2222222222 + 0.2222222222 + -0.2777777778x2 + x4 = 0 + 0.2222222222

Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000
0.0000000000 + -0.2777777778x2 + x4 = 0 + 0.2222222222
-0.2777777778x2 + x4 = 0 + 0.2222222222

Combine like terms: 0 + 0.2222222222 = 0.2222222222
-0.2777777778x2 + x4 = 0.2222222222

The x term is -0.2777777778x2.  Take half its coefficient (-0.1388888889).
Square it (0.01929012346) and add it to both sides.

Add '0.01929012346' to each side of the equation.
-0.2777777778x2 + 0.01929012346 + x4 = 0.2222222222 + 0.01929012346

Reorder the terms:
0.01929012346 + -0.2777777778x2 + x4 = 0.2222222222 + 0.01929012346

Combine like terms: 0.2222222222 + 0.01929012346 = 0.24151234566
0.01929012346 + -0.2777777778x2 + x4 = 0.24151234566

Factor a perfect square on the left side:
(x2 + -0.1388888889)(x2 + -0.1388888889) = 0.24151234566

Calculate the square root of the right side: 0.491439056

Break this problem into two subproblems by setting 
(x2 + -0.1388888889) equal to 0.491439056 and -0.491439056.

Subproblem 1

x2 + -0.1388888889 = 0.491439056 Simplifying x2 + -0.1388888889 = 0.491439056 Reorder the terms: -0.1388888889 + x2 = 0.491439056 Solving -0.1388888889 + x2 = 0.491439056 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1388888889' to each side of the equation. -0.1388888889 + 0.1388888889 + x2 = 0.491439056 + 0.1388888889 Combine like terms: -0.1388888889 + 0.1388888889 = 0.0000000000 0.0000000000 + x2 = 0.491439056 + 0.1388888889 x2 = 0.491439056 + 0.1388888889 Combine like terms: 0.491439056 + 0.1388888889 = 0.6303279449 x2 = 0.6303279449 Simplifying x2 = 0.6303279449 Take the square root of each side: x = {-0.793931952, 0.793931952}

Subproblem 2

x2 + -0.1388888889 = -0.491439056 Simplifying x2 + -0.1388888889 = -0.491439056 Reorder the terms: -0.1388888889 + x2 = -0.491439056 Solving -0.1388888889 + x2 = -0.491439056 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1388888889' to each side of the equation. -0.1388888889 + 0.1388888889 + x2 = -0.491439056 + 0.1388888889 Combine like terms: -0.1388888889 + 0.1388888889 = 0.0000000000 0.0000000000 + x2 = -0.491439056 + 0.1388888889 x2 = -0.491439056 + 0.1388888889 Combine like terms: -0.491439056 + 0.1388888889 = -0.3525501671 x2 = -0.3525501671 Simplifying x2 = -0.3525501671 Reorder the terms: 0.3525501671 + x2 = -0.3525501671 + 0.3525501671 Combine like terms: -0.3525501671 + 0.3525501671 = 0.0000000000 0.3525501671 + x2 = 0.0000000000 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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