(2y^2-8y+8)+(-3y^2+2y+3)-(y^2+3y-6)=

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Solution for (2y^2-8y+8)+(-3y^2+2y+3)-(y^2+3y-6)= equation:


Simplifying
(2y2 + -8y + 8) + (-3y2 + 2y + 3) + -1(y2 + 3y + -6) = 0

Reorder the terms:
(8 + -8y + 2y2) + (-3y2 + 2y + 3) + -1(y2 + 3y + -6) = 0

Remove parenthesis around (8 + -8y + 2y2)
8 + -8y + 2y2 + (-3y2 + 2y + 3) + -1(y2 + 3y + -6) = 0

Reorder the terms:
8 + -8y + 2y2 + (3 + 2y + -3y2) + -1(y2 + 3y + -6) = 0

Remove parenthesis around (3 + 2y + -3y2)
8 + -8y + 2y2 + 3 + 2y + -3y2 + -1(y2 + 3y + -6) = 0

Reorder the terms:
8 + -8y + 2y2 + 3 + 2y + -3y2 + -1(-6 + 3y + y2) = 0
8 + -8y + 2y2 + 3 + 2y + -3y2 + (-6 * -1 + 3y * -1 + y2 * -1) = 0
8 + -8y + 2y2 + 3 + 2y + -3y2 + (6 + -3y + -1y2) = 0

Reorder the terms:
8 + 3 + 6 + -8y + 2y + -3y + 2y2 + -3y2 + -1y2 = 0

Combine like terms: 8 + 3 = 11
11 + 6 + -8y + 2y + -3y + 2y2 + -3y2 + -1y2 = 0

Combine like terms: 11 + 6 = 17
17 + -8y + 2y + -3y + 2y2 + -3y2 + -1y2 = 0

Combine like terms: -8y + 2y = -6y
17 + -6y + -3y + 2y2 + -3y2 + -1y2 = 0

Combine like terms: -6y + -3y = -9y
17 + -9y + 2y2 + -3y2 + -1y2 = 0

Combine like terms: 2y2 + -3y2 = -1y2
17 + -9y + -1y2 + -1y2 = 0

Combine like terms: -1y2 + -1y2 = -2y2
17 + -9y + -2y2 = 0

Solving
17 + -9y + -2y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
-8.5 + 4.5y + y2 = 0

Move the constant term to the right:

Add '8.5' to each side of the equation.
-8.5 + 4.5y + 8.5 + y2 = 0 + 8.5

Reorder the terms:
-8.5 + 8.5 + 4.5y + y2 = 0 + 8.5

Combine like terms: -8.5 + 8.5 = 0.0
0.0 + 4.5y + y2 = 0 + 8.5
4.5y + y2 = 0 + 8.5

Combine like terms: 0 + 8.5 = 8.5
4.5y + y2 = 8.5

The y term is 4.5y.  Take half its coefficient (2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
4.5y + 5.0625 + y2 = 8.5 + 5.0625

Reorder the terms:
5.0625 + 4.5y + y2 = 8.5 + 5.0625

Combine like terms: 8.5 + 5.0625 = 13.5625
5.0625 + 4.5y + y2 = 13.5625

Factor a perfect square on the left side:
(y + 2.25)(y + 2.25) = 13.5625

Calculate the square root of the right side: 3.682729966

Break this problem into two subproblems by setting 
(y + 2.25) equal to 3.682729966 and -3.682729966.

Subproblem 1

y + 2.25 = 3.682729966 Simplifying y + 2.25 = 3.682729966 Reorder the terms: 2.25 + y = 3.682729966 Solving 2.25 + y = 3.682729966 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + y = 3.682729966 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + y = 3.682729966 + -2.25 y = 3.682729966 + -2.25 Combine like terms: 3.682729966 + -2.25 = 1.432729966 y = 1.432729966 Simplifying y = 1.432729966

Subproblem 2

y + 2.25 = -3.682729966 Simplifying y + 2.25 = -3.682729966 Reorder the terms: 2.25 + y = -3.682729966 Solving 2.25 + y = -3.682729966 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.25' to each side of the equation. 2.25 + -2.25 + y = -3.682729966 + -2.25 Combine like terms: 2.25 + -2.25 = 0.00 0.00 + y = -3.682729966 + -2.25 y = -3.682729966 + -2.25 Combine like terms: -3.682729966 + -2.25 = -5.932729966 y = -5.932729966 Simplifying y = -5.932729966

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.432729966, -5.932729966}

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