(-3y^2-9y)+(9y^2+2y-2)=

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Solution for (-3y^2-9y)+(9y^2+2y-2)= equation:


Simplifying
(-3y2 + -9y) + (9y2 + 2y + -2) = 0

Reorder the terms:
(-9y + -3y2) + (9y2 + 2y + -2) = 0

Remove parenthesis around (-9y + -3y2)
-9y + -3y2 + (9y2 + 2y + -2) = 0

Reorder the terms:
-9y + -3y2 + (-2 + 2y + 9y2) = 0

Remove parenthesis around (-2 + 2y + 9y2)
-9y + -3y2 + -2 + 2y + 9y2 = 0

Reorder the terms:
-2 + -9y + 2y + -3y2 + 9y2 = 0

Combine like terms: -9y + 2y = -7y
-2 + -7y + -3y2 + 9y2 = 0

Combine like terms: -3y2 + 9y2 = 6y2
-2 + -7y + 6y2 = 0

Solving
-2 + -7y + 6y2 = 0

Solving for variable 'y'.

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

Divide each side by '6'.
-0.3333333333 + -1.166666667y + y2 = 0

Move the constant term to the right:

Add '0.3333333333' to each side of the equation.
-0.3333333333 + -1.166666667y + 0.3333333333 + y2 = 0 + 0.3333333333

Reorder the terms:
-0.3333333333 + 0.3333333333 + -1.166666667y + y2 = 0 + 0.3333333333

Combine like terms: -0.3333333333 + 0.3333333333 = 0.0000000000
0.0000000000 + -1.166666667y + y2 = 0 + 0.3333333333
-1.166666667y + y2 = 0 + 0.3333333333

Combine like terms: 0 + 0.3333333333 = 0.3333333333
-1.166666667y + y2 = 0.3333333333

The y term is -1.166666667y.  Take half its coefficient (-0.5833333335).
Square it (0.3402777780) and add it to both sides.

Add '0.3402777780' to each side of the equation.
-1.166666667y + 0.3402777780 + y2 = 0.3333333333 + 0.3402777780

Reorder the terms:
0.3402777780 + -1.166666667y + y2 = 0.3333333333 + 0.3402777780

Combine like terms: 0.3333333333 + 0.3402777780 = 0.6736111113
0.3402777780 + -1.166666667y + y2 = 0.6736111113

Factor a perfect square on the left side:
(y + -0.5833333335)(y + -0.5833333335) = 0.6736111113

Calculate the square root of the right side: 0.82073815

Break this problem into two subproblems by setting 
(y + -0.5833333335) equal to 0.82073815 and -0.82073815.

Subproblem 1

y + -0.5833333335 = 0.82073815 Simplifying y + -0.5833333335 = 0.82073815 Reorder the terms: -0.5833333335 + y = 0.82073815 Solving -0.5833333335 + y = 0.82073815 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5833333335' to each side of the equation. -0.5833333335 + 0.5833333335 + y = 0.82073815 + 0.5833333335 Combine like terms: -0.5833333335 + 0.5833333335 = 0.0000000000 0.0000000000 + y = 0.82073815 + 0.5833333335 y = 0.82073815 + 0.5833333335 Combine like terms: 0.82073815 + 0.5833333335 = 1.4040714835 y = 1.4040714835 Simplifying y = 1.4040714835

Subproblem 2

y + -0.5833333335 = -0.82073815 Simplifying y + -0.5833333335 = -0.82073815 Reorder the terms: -0.5833333335 + y = -0.82073815 Solving -0.5833333335 + y = -0.82073815 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.5833333335' to each side of the equation. -0.5833333335 + 0.5833333335 + y = -0.82073815 + 0.5833333335 Combine like terms: -0.5833333335 + 0.5833333335 = 0.0000000000 0.0000000000 + y = -0.82073815 + 0.5833333335 y = -0.82073815 + 0.5833333335 Combine like terms: -0.82073815 + 0.5833333335 = -0.2374048165 y = -0.2374048165 Simplifying y = -0.2374048165

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.4040714835, -0.2374048165}

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