9y^2+12y-4=0

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Solution for 9y^2+12y-4=0 equation: 


Simplifying
9y2 + 12y + -4 = 0

Reorder the terms:
-4 + 12y + 9y2 = 0

Solving
-4 + 12y + 9y2 = 0

Solving for variable 'y'.

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

Divide each side by '9'.
-0.4444444444 + 1.333333333y + y2 = 0

Move the constant term to the right:

Add '0.4444444444' to each side of the equation.
-0.4444444444 + 1.333333333y + 0.4444444444 + y2 = 0 + 0.4444444444

Reorder the terms:
-0.4444444444 + 0.4444444444 + 1.333333333y + y2 = 0 + 0.4444444444

Combine like terms: -0.4444444444 + 0.4444444444 = 0.0000000000
0.0000000000 + 1.333333333y + y2 = 0 + 0.4444444444
1.333333333y + y2 = 0 + 0.4444444444

Combine like terms: 0 + 0.4444444444 = 0.4444444444
1.333333333y + y2 = 0.4444444444

The y term is 1.333333333y.  Take half its coefficient (0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
1.333333333y + 0.4444444442 + y2 = 0.4444444444 + 0.4444444442

Reorder the terms:
0.4444444442 + 1.333333333y + y2 = 0.4444444444 + 0.4444444442

Combine like terms: 0.4444444444 + 0.4444444442 = 0.8888888886
0.4444444442 + 1.333333333y + y2 = 0.8888888886

Factor a perfect square on the left side:
(y + 0.6666666665)(y + 0.6666666665) = 0.8888888886

Calculate the square root of the right side: 0.942809041

Break this problem into two subproblems by setting 
(y + 0.6666666665) equal to 0.942809041 and -0.942809041.


Subproblem 1
y + 0.6666666665 = 0.942809041

Simplifying
y + 0.6666666665 = 0.942809041

Reorder the terms:
0.6666666665 + y = 0.942809041

Solving
0.6666666665 + y = 0.942809041

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-0.6666666665' to each side of the equation.
0.6666666665 + -0.6666666665 + y = 0.942809041 + -0.6666666665

Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000
0.0000000000 + y = 0.942809041 + -0.6666666665
y = 0.942809041 + -0.6666666665

Combine like terms: 0.942809041 + -0.6666666665 = 0.2761423745
y = 0.2761423745

Simplifying
y = 0.2761423745


Subproblem 2
y + 0.6666666665 = -0.942809041

Simplifying
y + 0.6666666665 = -0.942809041

Reorder the terms:
0.6666666665 + y = -0.942809041

Solving
0.6666666665 + y = -0.942809041

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-0.6666666665' to each side of the equation.
0.6666666665 + -0.6666666665 + y = -0.942809041 + -0.6666666665

Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000
0.0000000000 + y = -0.942809041 + -0.6666666665
y = -0.942809041 + -0.6666666665

Combine like terms: -0.942809041 + -0.6666666665 = -1.6094757075
y = -1.6094757075

Simplifying
y = -1.6094757075


Solution
The solution to the problem is based on the solutions
from the subproblems.
y = {0.2761423745, -1.6094757075}

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