3x^4-12x^2+5=0

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Solution for 3x^4-12x^2+5=0 equation:


Simplifying
3x4 + -12x2 + 5 = 0

Reorder the terms:
5 + -12x2 + 3x4 = 0

Solving
5 + -12x2 + 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'.
1.666666667 + -4x2 + x4 = 0

Move the constant term to the right:

Add '-1.666666667' to each side of the equation.
1.666666667 + -4x2 + -1.666666667 + x4 = 0 + -1.666666667

Reorder the terms:
1.666666667 + -1.666666667 + -4x2 + x4 = 0 + -1.666666667

Combine like terms: 1.666666667 + -1.666666667 = 0.000000000
0.000000000 + -4x2 + x4 = 0 + -1.666666667
-4x2 + x4 = 0 + -1.666666667

Combine like terms: 0 + -1.666666667 = -1.666666667
-4x2 + x4 = -1.666666667

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 = -1.666666667 + 4

Reorder the terms:
4 + -4x2 + x4 = -1.666666667 + 4

Combine like terms: -1.666666667 + 4 = 2.333333333
4 + -4x2 + x4 = 2.333333333

Factor a perfect square on the left side:
(x2 + -2)(x2 + -2) = 2.333333333

Calculate the square root of the right side: 1.527525232

Break this problem into two subproblems by setting 
(x2 + -2) equal to 1.527525232 and -1.527525232.

Subproblem 1

x2 + -2 = 1.527525232 Simplifying x2 + -2 = 1.527525232 Reorder the terms: -2 + x2 = 1.527525232 Solving -2 + x2 = 1.527525232 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 = 1.527525232 + 2 Combine like terms: -2 + 2 = 0 0 + x2 = 1.527525232 + 2 x2 = 1.527525232 + 2 Combine like terms: 1.527525232 + 2 = 3.527525232 x2 = 3.527525232 Simplifying x2 = 3.527525232 Take the square root of each side: x = {-1.878170714, 1.878170714}

Subproblem 2

x2 + -2 = -1.527525232 Simplifying x2 + -2 = -1.527525232 Reorder the terms: -2 + x2 = -1.527525232 Solving -2 + x2 = -1.527525232 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 = -1.527525232 + 2 Combine like terms: -2 + 2 = 0 0 + x2 = -1.527525232 + 2 x2 = -1.527525232 + 2 Combine like terms: -1.527525232 + 2 = 0.472474768 x2 = 0.472474768 Simplifying x2 = 0.472474768 Take the square root of each side: x = {-0.687368, 0.687368}

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.878170714, 1.878170714, -0.687368, 0.687368}

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