9y^2-42y+-99=0

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Solution for 9y^2-42y+-99=0 equation: 


Simplifying
9y2 + -42y + -99 = 0

Reorder the terms:
-99 + -42y + 9y2 = 0

Solving
-99 + -42y + 9y2 = 0

Solving for variable 'y'.

Factor out the Greatest Common Factor (GCF), '3'.
3(-33 + -14y + 3y2) = 0

Ignore the factor 3.

Subproblem 1
Set the factor '(-33 + -14y + 3y2)' equal to zero and attempt to solve:

Simplifying
-33 + -14y + 3y2 = 0

Solving
-33 + -14y + 3y2 = 0

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

Divide each side by '3'.
-11 + -4.666666667y + y2 = 0

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + -4.666666667y + 11 + y2 = 0 + 11

Reorder the terms:
-11 + 11 + -4.666666667y + y2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + -4.666666667y + y2 = 0 + 11
-4.666666667y + y2 = 0 + 11

Combine like terms: 0 + 11 = 11
-4.666666667y + y2 = 11

The y term is -4.666666667y.  Take half its coefficient (-2.333333334).
Square it (5.444444448) and add it to both sides.

Add '5.444444448' to each side of the equation.
-4.666666667y + 5.444444448 + y2 = 11 + 5.444444448

Reorder the terms:
5.444444448 + -4.666666667y + y2 = 11 + 5.444444448

Combine like terms: 11 + 5.444444448 = 16.444444448
5.444444448 + -4.666666667y + y2 = 16.444444448

Factor a perfect square on the left side:
(y + -2.333333334)(y + -2.333333334) = 16.444444448

Calculate the square root of the right side: 4.055175021

Break this problem into two subproblems by setting 
(y + -2.333333334) equal to 4.055175021 and -4.055175021.


Subproblem 1
y + -2.333333334 = 4.055175021

Simplifying
y + -2.333333334 = 4.055175021

Reorder the terms:
-2.333333334 + y = 4.055175021

Solving
-2.333333334 + y = 4.055175021

Solving for variable 'y'.

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

Add '2.333333334' to each side of the equation.
-2.333333334 + 2.333333334 + y = 4.055175021 + 2.333333334

Combine like terms: -2.333333334 + 2.333333334 = 0.000000000
0.000000000 + y = 4.055175021 + 2.333333334
y = 4.055175021 + 2.333333334

Combine like terms: 4.055175021 + 2.333333334 = 6.388508355
y = 6.388508355

Simplifying
y = 6.388508355


Subproblem 2
y + -2.333333334 = -4.055175021

Simplifying
y + -2.333333334 = -4.055175021

Reorder the terms:
-2.333333334 + y = -4.055175021

Solving
-2.333333334 + y = -4.055175021

Solving for variable 'y'.

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

Add '2.333333334' to each side of the equation.
-2.333333334 + 2.333333334 + y = -4.055175021 + 2.333333334

Combine like terms: -2.333333334 + 2.333333334 = 0.000000000
0.000000000 + y = -4.055175021 + 2.333333334
y = -4.055175021 + 2.333333334

Combine like terms: -4.055175021 + 2.333333334 = -1.721841687
y = -1.721841687

Simplifying
y = -1.721841687


Solution
The solution to the problem is based on the solutions
from the subproblems.
y = {6.388508355, -1.721841687}
Solution
y = {6.388508355, -1.721841687}

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