3y^4-9y^2+4=0

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Solution for 3y^4-9y^2+4=0 equation:


Simplifying
3y4 + -9y2 + 4 = 0

Reorder the terms:
4 + -9y2 + 3y4 = 0

Solving
4 + -9y2 + 3y4 = 0

Solving for variable 'y'.

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

Divide each side by '3'.
1.333333333 + -3y2 + y4 = 0

Move the constant term to the right:

Add '-1.333333333' to each side of the equation.
1.333333333 + -3y2 + -1.333333333 + y4 = 0 + -1.333333333

Reorder the terms:
1.333333333 + -1.333333333 + -3y2 + y4 = 0 + -1.333333333

Combine like terms: 1.333333333 + -1.333333333 = 0.000000000
0.000000000 + -3y2 + y4 = 0 + -1.333333333
-3y2 + y4 = 0 + -1.333333333

Combine like terms: 0 + -1.333333333 = -1.333333333
-3y2 + y4 = -1.333333333

The y term is -3y2.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3y2 + 2.25 + y4 = -1.333333333 + 2.25

Reorder the terms:
2.25 + -3y2 + y4 = -1.333333333 + 2.25

Combine like terms: -1.333333333 + 2.25 = 0.916666667
2.25 + -3y2 + y4 = 0.916666667

Factor a perfect square on the left side:
(y2 + -1.5)(y2 + -1.5) = 0.916666667

Calculate the square root of the right side: 0.957427108

Break this problem into two subproblems by setting 
(y2 + -1.5) equal to 0.957427108 and -0.957427108.

Subproblem 1

y2 + -1.5 = 0.957427108 Simplifying y2 + -1.5 = 0.957427108 Reorder the terms: -1.5 + y2 = 0.957427108 Solving -1.5 + y2 = 0.957427108 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + y2 = 0.957427108 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + y2 = 0.957427108 + 1.5 y2 = 0.957427108 + 1.5 Combine like terms: 0.957427108 + 1.5 = 2.457427108 y2 = 2.457427108 Simplifying y2 = 2.457427108 Take the square root of each side: y = {-1.567618292, 1.567618292}

Subproblem 2

y2 + -1.5 = -0.957427108 Simplifying y2 + -1.5 = -0.957427108 Reorder the terms: -1.5 + y2 = -0.957427108 Solving -1.5 + y2 = -0.957427108 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + y2 = -0.957427108 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + y2 = -0.957427108 + 1.5 y2 = -0.957427108 + 1.5 Combine like terms: -0.957427108 + 1.5 = 0.542572892 y2 = 0.542572892 Simplifying y2 = 0.542572892 Take the square root of each side: y = {-0.736595474, 0.736595474}

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-1.567618292, 1.567618292, -0.736595474, 0.736595474}

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