5*x^4-20*x^2+10.8=0

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Solution for 5*x^4-20*x^2+10.8=0 equation:


Simplifying
5x4 + -20x2 + 10.8 = 0

Reorder the terms:
10.8 + -20x2 + 5x4 = 0

Solving
10.8 + -20x2 + 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'.
2.16 + -4x2 + x4 = 0

Move the constant term to the right:

Add '-2.16' to each side of the equation.
2.16 + -4x2 + -2.16 + x4 = 0 + -2.16

Reorder the terms:
2.16 + -2.16 + -4x2 + x4 = 0 + -2.16

Combine like terms: 2.16 + -2.16 = 0.00
0.00 + -4x2 + x4 = 0 + -2.16
-4x2 + x4 = 0 + -2.16

Combine like terms: 0 + -2.16 = -2.16
-4x2 + x4 = -2.16

The x term is -4x2.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x2 + 4 + x4 = -2.16 + 4

Reorder the terms:
4 + -4x2 + x4 = -2.16 + 4

Combine like terms: -2.16 + 4 = 1.84
4 + -4x2 + x4 = 1.84

Factor a perfect square on the left side:
(x2 + -2)(x2 + -2) = 1.84

Calculate the square root of the right side: 1.356465997

Break this problem into two subproblems by setting 
(x2 + -2) equal to 1.356465997 and -1.356465997.

Subproblem 1

x2 + -2 = 1.356465997 Simplifying x2 + -2 = 1.356465997 Reorder the terms: -2 + x2 = 1.356465997 Solving -2 + x2 = 1.356465997 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x2 = 1.356465997 + 2 Combine like terms: -2 + 2 = 0 0 + x2 = 1.356465997 + 2 x2 = 1.356465997 + 2 Combine like terms: 1.356465997 + 2 = 3.356465997 x2 = 3.356465997 Simplifying x2 = 3.356465997 Take the square root of each side: x = {-1.832066046, 1.832066046}

Subproblem 2

x2 + -2 = -1.356465997 Simplifying x2 + -2 = -1.356465997 Reorder the terms: -2 + x2 = -1.356465997 Solving -2 + x2 = -1.356465997 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x2 = -1.356465997 + 2 Combine like terms: -2 + 2 = 0 0 + x2 = -1.356465997 + 2 x2 = -1.356465997 + 2 Combine like terms: -1.356465997 + 2 = 0.643534003 x2 = 0.643534003 Simplifying x2 = 0.643534003 Take the square root of each side: x = {-0.802205711, 0.802205711}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.832066046, 1.832066046, -0.802205711, 0.802205711}

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