3x^4-32x^2+28=0

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Solution for 3x^4-32x^2+28=0 equation:


Simplifying
3x4 + -32x2 + 28 = 0

Reorder the terms:
28 + -32x2 + 3x4 = 0

Solving
28 + -32x2 + 3x4 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
9.333333333 + -10.66666667x2 + x4 = 0

Move the constant term to the right:

Add '-9.333333333' to each side of the equation.
9.333333333 + -10.66666667x2 + -9.333333333 + x4 = 0 + -9.333333333

Reorder the terms:
9.333333333 + -9.333333333 + -10.66666667x2 + x4 = 0 + -9.333333333

Combine like terms: 9.333333333 + -9.333333333 = 0.000000000
0.000000000 + -10.66666667x2 + x4 = 0 + -9.333333333
-10.66666667x2 + x4 = 0 + -9.333333333

Combine like terms: 0 + -9.333333333 = -9.333333333
-10.66666667x2 + x4 = -9.333333333

The x term is -10.66666667x2.  Take half its coefficient (-5.333333335).
Square it (28.44444446) and add it to both sides.

Add '28.44444446' to each side of the equation.
-10.66666667x2 + 28.44444446 + x4 = -9.333333333 + 28.44444446

Reorder the terms:
28.44444446 + -10.66666667x2 + x4 = -9.333333333 + 28.44444446

Combine like terms: -9.333333333 + 28.44444446 = 19.111111127
28.44444446 + -10.66666667x2 + x4 = 19.111111127

Factor a perfect square on the left side:
(x2 + -5.333333335)(x2 + -5.333333335) = 19.111111127

Calculate the square root of the right side: 4.371625685

Break this problem into two subproblems by setting 
(x2 + -5.333333335) equal to 4.371625685 and -4.371625685.

Subproblem 1

x2 + -5.333333335 = 4.371625685 Simplifying x2 + -5.333333335 = 4.371625685 Reorder the terms: -5.333333335 + x2 = 4.371625685 Solving -5.333333335 + x2 = 4.371625685 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.333333335' to each side of the equation. -5.333333335 + 5.333333335 + x2 = 4.371625685 + 5.333333335 Combine like terms: -5.333333335 + 5.333333335 = 0.000000000 0.000000000 + x2 = 4.371625685 + 5.333333335 x2 = 4.371625685 + 5.333333335 Combine like terms: 4.371625685 + 5.333333335 = 9.70495902 x2 = 9.70495902 Simplifying x2 = 9.70495902 Take the square root of each side: x = {-3.115278321, 3.115278321}

Subproblem 2

x2 + -5.333333335 = -4.371625685 Simplifying x2 + -5.333333335 = -4.371625685 Reorder the terms: -5.333333335 + x2 = -4.371625685 Solving -5.333333335 + x2 = -4.371625685 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.333333335' to each side of the equation. -5.333333335 + 5.333333335 + x2 = -4.371625685 + 5.333333335 Combine like terms: -5.333333335 + 5.333333335 = 0.000000000 0.000000000 + x2 = -4.371625685 + 5.333333335 x2 = -4.371625685 + 5.333333335 Combine like terms: -4.371625685 + 5.333333335 = 0.96170765 x2 = 0.96170765 Simplifying x2 = 0.96170765 Take the square root of each side: x = {-0.980666941, 0.980666941}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3.115278321, 3.115278321, -0.980666941, 0.980666941}

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