9y^2+12y-8=0

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Solution for 9y^2+12y-8=0 equation:


Simplifying
9y2 + 12y + -8 = 0

Reorder the terms:
-8 + 12y + 9y2 = 0

Solving
-8 + 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'.
-0.8888888889 + 1.333333333y + y2 = 0

Move the constant term to the right:

Add '0.8888888889' to each side of the equation.
-0.8888888889 + 1.333333333y + 0.8888888889 + y2 = 0 + 0.8888888889

Reorder the terms:
-0.8888888889 + 0.8888888889 + 1.333333333y + y2 = 0 + 0.8888888889

Combine like terms: -0.8888888889 + 0.8888888889 = 0.0000000000
0.0000000000 + 1.333333333y + y2 = 0 + 0.8888888889
1.333333333y + y2 = 0 + 0.8888888889

Combine like terms: 0 + 0.8888888889 = 0.8888888889
1.333333333y + y2 = 0.8888888889

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 = 0.8888888889 + 0.4444444442

Reorder the terms:
0.4444444442 + 1.333333333y + y2 = 0.8888888889 + 0.4444444442

Combine like terms: 0.8888888889 + 0.4444444442 = 1.3333333331
0.4444444442 + 1.333333333y + y2 = 1.3333333331

Factor a perfect square on the left side:
(y + 0.6666666665)(y + 0.6666666665) = 1.3333333331

Calculate the square root of the right side: 1.154700538

Break this problem into two subproblems by setting 
(y + 0.6666666665) equal to 1.154700538 and -1.154700538.

Subproblem 1

y + 0.6666666665 = 1.154700538 Simplifying y + 0.6666666665 = 1.154700538 Reorder the terms: 0.6666666665 + y = 1.154700538 Solving 0.6666666665 + y = 1.154700538 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 = 1.154700538 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + y = 1.154700538 + -0.6666666665 y = 1.154700538 + -0.6666666665 Combine like terms: 1.154700538 + -0.6666666665 = 0.4880338715 y = 0.4880338715 Simplifying y = 0.4880338715

Subproblem 2

y + 0.6666666665 = -1.154700538 Simplifying y + 0.6666666665 = -1.154700538 Reorder the terms: 0.6666666665 + y = -1.154700538 Solving 0.6666666665 + y = -1.154700538 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 = -1.154700538 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + y = -1.154700538 + -0.6666666665 y = -1.154700538 + -0.6666666665 Combine like terms: -1.154700538 + -0.6666666665 = -1.8213672045 y = -1.8213672045 Simplifying y = -1.8213672045

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.4880338715, -1.8213672045}

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