0.28019x^4+-5.599x^2+1=0

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Solution for 0.28019x^4+-5.599x^2+1=0 equation:


Simplifying
0.28019x4 + -5.599x2 + 1 = 0

Reorder the terms:
1 + -5.599x2 + 0.28019x4 = 0

Solving
1 + -5.599x2 + 0.28019x4 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
0.28019 the coefficient of the squared term: 

Divide each side by '0.28019'.
3.569006745 + -19.98286877x2 + x4 = 0

Move the constant term to the right:

Add '-3.569006745' to each side of the equation.
3.569006745 + -19.98286877x2 + -3.569006745 + x4 = 0 + -3.569006745

Reorder the terms:
3.569006745 + -3.569006745 + -19.98286877x2 + x4 = 0 + -3.569006745

Combine like terms: 3.569006745 + -3.569006745 = 0.000000000
0.000000000 + -19.98286877x2 + x4 = 0 + -3.569006745
-19.98286877x2 + x4 = 0 + -3.569006745

Combine like terms: 0 + -3.569006745 = -3.569006745
-19.98286877x2 + x4 = -3.569006745

The x term is -19.98286877x2.  Take half its coefficient (-9.991434385).
Square it (99.82876107) and add it to both sides.

Add '99.82876107' to each side of the equation.
-19.98286877x2 + 99.82876107 + x4 = -3.569006745 + 99.82876107

Reorder the terms:
99.82876107 + -19.98286877x2 + x4 = -3.569006745 + 99.82876107

Combine like terms: -3.569006745 + 99.82876107 = 96.259754325
99.82876107 + -19.98286877x2 + x4 = 96.259754325

Factor a perfect square on the left side:
(x2 + -9.991434385)(x2 + -9.991434385) = 96.259754325

Calculate the square root of the right side: 9.811205549

Break this problem into two subproblems by setting 
(x2 + -9.991434385) equal to 9.811205549 and -9.811205549.

Subproblem 1

x2 + -9.991434385 = 9.811205549 Simplifying x2 + -9.991434385 = 9.811205549 Reorder the terms: -9.991434385 + x2 = 9.811205549 Solving -9.991434385 + x2 = 9.811205549 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.991434385' to each side of the equation. -9.991434385 + 9.991434385 + x2 = 9.811205549 + 9.991434385 Combine like terms: -9.991434385 + 9.991434385 = 0.000000000 0.000000000 + x2 = 9.811205549 + 9.991434385 x2 = 9.811205549 + 9.991434385 Combine like terms: 9.811205549 + 9.991434385 = 19.802639934 x2 = 19.802639934 Simplifying x2 = 19.802639934 Take the square root of each side: x = {-4.450015723, 4.450015723}

Subproblem 2

x2 + -9.991434385 = -9.811205549 Simplifying x2 + -9.991434385 = -9.811205549 Reorder the terms: -9.991434385 + x2 = -9.811205549 Solving -9.991434385 + x2 = -9.811205549 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9.991434385' to each side of the equation. -9.991434385 + 9.991434385 + x2 = -9.811205549 + 9.991434385 Combine like terms: -9.991434385 + 9.991434385 = 0.000000000 0.000000000 + x2 = -9.811205549 + 9.991434385 x2 = -9.811205549 + 9.991434385 Combine like terms: -9.811205549 + 9.991434385 = 0.180228836 x2 = 0.180228836 Simplifying x2 = 0.180228836 Take the square root of each side: x = {-0.424533669, 0.424533669}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-4.450015723, 4.450015723, -0.424533669, 0.424533669}

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