(2y^4)-(9y^2)+1=0

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Solution for (2y^4)-(9y^2)+1=0 equation:


Simplifying
(2y4) + -1(9y2) + 1 = 0

Remove parenthesis around (9y2)
(2y4) + -1 * 9y2 + 1 = 0

Multiply -1 * 9
(2y4) + -9y2 + 1 = 0

Reorder the terms:
1 + -9y2 + (2y4) = 0

Solving
1 + -9y2 + (2y4) = 0

Solving for variable 'y'.

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

Divide each side by '2'.
0.5 + -4.5y2 + y4 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + -4.5y2 + -0.5 + y4 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + -4.5y2 + y4 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + -4.5y2 + y4 = 0 + -0.5
-4.5y2 + y4 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
-4.5y2 + y4 = -0.5

The y term is -4.5y2.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5y2 + 5.0625 + y4 = -0.5 + 5.0625

Reorder the terms:
5.0625 + -4.5y2 + y4 = -0.5 + 5.0625

Combine like terms: -0.5 + 5.0625 = 4.5625
5.0625 + -4.5y2 + y4 = 4.5625

Factor a perfect square on the left side:
((y2) + -2.25)((y2) + -2.25) = 4.5625

Calculate the square root of the right side: 2.136000936

Break this problem into two subproblems by setting 
((y2) + -2.25) equal to 2.136000936 and -2.136000936.

Subproblem 1

(y2) + -2.25 = 2.136000936 Simplifying (y2) + -2.25 = 2.136000936 y2 + -2.25 = 2.136000936 Reorder the terms: -2.25 + y2 = 2.136000936 Solving -2.25 + y2 = 2.136000936 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + y2 = 2.136000936 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + y2 = 2.136000936 + 2.25 y2 = 2.136000936 + 2.25 Combine like terms: 2.136000936 + 2.25 = 4.386000936 y2 = 4.386000936 Simplifying y2 = 4.386000936 Take the square root of each side: y = {-2.094278142, 2.094278142}

Subproblem 2

(y2) + -2.25 = -2.136000936 Simplifying (y2) + -2.25 = -2.136000936 y2 + -2.25 = -2.136000936 Reorder the terms: -2.25 + y2 = -2.136000936 Solving -2.25 + y2 = -2.136000936 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + y2 = -2.136000936 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + y2 = -2.136000936 + 2.25 y2 = -2.136000936 + 2.25 Combine like terms: -2.136000936 + 2.25 = 0.113999064 y2 = 0.113999064 Simplifying y2 = 0.113999064 Take the square root of each side: y = {-0.337637474, 0.337637474}

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-2.094278142, 2.094278142, -0.337637474, 0.337637474}

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