(-2y^2-8y)+(3y^2+2y-8)=0

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Solution for (-2y^2-8y)+(3y^2+2y-8)=0 equation:


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

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

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

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

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

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

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

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

Solving
-8 + -6y + 1y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -6y + 8 + y2 = 0 + 8

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

Combine like terms: -8 + 8 = 0
0 + -6y + y2 = 0 + 8
-6y + y2 = 0 + 8

Combine like terms: 0 + 8 = 8
-6y + y2 = 8

The y term is -6y.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6y + 9 + y2 = 8 + 9

Reorder the terms:
9 + -6y + y2 = 8 + 9

Combine like terms: 8 + 9 = 17
9 + -6y + y2 = 17

Factor a perfect square on the left side:
(y + -3)(y + -3) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(y + -3) equal to 4.123105626 and -4.123105626.

Subproblem 1

y + -3 = 4.123105626 Simplifying y + -3 = 4.123105626 Reorder the terms: -3 + y = 4.123105626 Solving -3 + y = 4.123105626 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + y = 4.123105626 + 3 Combine like terms: -3 + 3 = 0 0 + y = 4.123105626 + 3 y = 4.123105626 + 3 Combine like terms: 4.123105626 + 3 = 7.123105626 y = 7.123105626 Simplifying y = 7.123105626

Subproblem 2

y + -3 = -4.123105626 Simplifying y + -3 = -4.123105626 Reorder the terms: -3 + y = -4.123105626 Solving -3 + y = -4.123105626 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + y = -4.123105626 + 3 Combine like terms: -3 + 3 = 0 0 + y = -4.123105626 + 3 y = -4.123105626 + 3 Combine like terms: -4.123105626 + 3 = -1.123105626 y = -1.123105626 Simplifying y = -1.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.123105626, -1.123105626}

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