5x^4-30x^2+1=0

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Solution for 5x^4-30x^2+1=0 equation:


Simplifying
5x4 + -30x2 + 1 = 0

Reorder the terms:
1 + -30x2 + 5x4 = 0

Solving
1 + -30x2 + 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 + -6x2 + x4 = 0

Move the constant term to the right:

Add '-0.2' to each side of the equation.
0.2 + -6x2 + -0.2 + x4 = 0 + -0.2

Reorder the terms:
0.2 + -0.2 + -6x2 + x4 = 0 + -0.2

Combine like terms: 0.2 + -0.2 = 0.0
0.0 + -6x2 + x4 = 0 + -0.2
-6x2 + x4 = 0 + -0.2

Combine like terms: 0 + -0.2 = -0.2
-6x2 + x4 = -0.2

The x term is -6x2.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x2 + 9 + x4 = -0.2 + 9

Reorder the terms:
9 + -6x2 + x4 = -0.2 + 9

Combine like terms: -0.2 + 9 = 8.8
9 + -6x2 + x4 = 8.8

Factor a perfect square on the left side:
(x2 + -3)(x2 + -3) = 8.8

Calculate the square root of the right side: 2.966479395

Break this problem into two subproblems by setting 
(x2 + -3) equal to 2.966479395 and -2.966479395.

Subproblem 1

x2 + -3 = 2.966479395 Simplifying x2 + -3 = 2.966479395 Reorder the terms: -3 + x2 = 2.966479395 Solving -3 + x2 = 2.966479395 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x2 = 2.966479395 + 3 Combine like terms: -3 + 3 = 0 0 + x2 = 2.966479395 + 3 x2 = 2.966479395 + 3 Combine like terms: 2.966479395 + 3 = 5.966479395 x2 = 5.966479395 Simplifying x2 = 5.966479395 Take the square root of each side: x = {-2.442637794, 2.442637794}

Subproblem 2

x2 + -3 = -2.966479395 Simplifying x2 + -3 = -2.966479395 Reorder the terms: -3 + x2 = -2.966479395 Solving -3 + x2 = -2.966479395 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x2 = -2.966479395 + 3 Combine like terms: -3 + 3 = 0 0 + x2 = -2.966479395 + 3 x2 = -2.966479395 + 3 Combine like terms: -2.966479395 + 3 = 0.033520605 x2 = 0.033520605 Simplifying x2 = 0.033520605 Take the square root of each side: x = {-0.183086332, 0.183086332}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.442637794, 2.442637794, -0.183086332, 0.183086332}

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