(3y^2-5y)+(6y^2+y-9)=

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Solution for (3y^2-5y)+(6y^2+y-9)= equation:


Simplifying
(3y2 + -5y) + (6y2 + y + -9) = 0

Reorder the terms:
(-5y + 3y2) + (6y2 + y + -9) = 0

Remove parenthesis around (-5y + 3y2)
-5y + 3y2 + (6y2 + y + -9) = 0

Reorder the terms:
-5y + 3y2 + (-9 + y + 6y2) = 0

Remove parenthesis around (-9 + y + 6y2)
-5y + 3y2 + -9 + y + 6y2 = 0

Reorder the terms:
-9 + -5y + y + 3y2 + 6y2 = 0

Combine like terms: -5y + y = -4y
-9 + -4y + 3y2 + 6y2 = 0

Combine like terms: 3y2 + 6y2 = 9y2
-9 + -4y + 9y2 = 0

Solving
-9 + -4y + 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'.
-1 + -0.4444444444y + y2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.4444444444y + 1 + y2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.4444444444y + y2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.4444444444y + y2 = 0 + 1
-0.4444444444y + y2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.4444444444y + y2 = 1

The y term is -0.4444444444y.  Take half its coefficient (-0.2222222222).
Square it (0.04938271604) and add it to both sides.

Add '0.04938271604' to each side of the equation.
-0.4444444444y + 0.04938271604 + y2 = 1 + 0.04938271604

Reorder the terms:
0.04938271604 + -0.4444444444y + y2 = 1 + 0.04938271604

Combine like terms: 1 + 0.04938271604 = 1.04938271604
0.04938271604 + -0.4444444444y + y2 = 1.04938271604

Factor a perfect square on the left side:
(y + -0.2222222222)(y + -0.2222222222) = 1.04938271604

Calculate the square root of the right side: 1.024393829

Break this problem into two subproblems by setting 
(y + -0.2222222222) equal to 1.024393829 and -1.024393829.

Subproblem 1

y + -0.2222222222 = 1.024393829 Simplifying y + -0.2222222222 = 1.024393829 Reorder the terms: -0.2222222222 + y = 1.024393829 Solving -0.2222222222 + y = 1.024393829 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.2222222222' to each side of the equation. -0.2222222222 + 0.2222222222 + y = 1.024393829 + 0.2222222222 Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000 0.0000000000 + y = 1.024393829 + 0.2222222222 y = 1.024393829 + 0.2222222222 Combine like terms: 1.024393829 + 0.2222222222 = 1.2466160512 y = 1.2466160512 Simplifying y = 1.2466160512

Subproblem 2

y + -0.2222222222 = -1.024393829 Simplifying y + -0.2222222222 = -1.024393829 Reorder the terms: -0.2222222222 + y = -1.024393829 Solving -0.2222222222 + y = -1.024393829 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.2222222222' to each side of the equation. -0.2222222222 + 0.2222222222 + y = -1.024393829 + 0.2222222222 Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000 0.0000000000 + y = -1.024393829 + 0.2222222222 y = -1.024393829 + 0.2222222222 Combine like terms: -1.024393829 + 0.2222222222 = -0.8021716068 y = -0.8021716068 Simplifying y = -0.8021716068

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.2466160512, -0.8021716068}

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