(-3y^2-4y-4)-(4y^2-9y-8)+(5y^2+2y+3)=

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Solution for (-3y^2-4y-4)-(4y^2-9y-8)+(5y^2+2y+3)= equation:


Simplifying
(-3y2 + -4y + -4) + -1(4y2 + -9y + -8) + (5y2 + 2y + 3) = 0

Reorder the terms:
(-4 + -4y + -3y2) + -1(4y2 + -9y + -8) + (5y2 + 2y + 3) = 0

Remove parenthesis around (-4 + -4y + -3y2)
-4 + -4y + -3y2 + -1(4y2 + -9y + -8) + (5y2 + 2y + 3) = 0

Reorder the terms:
-4 + -4y + -3y2 + -1(-8 + -9y + 4y2) + (5y2 + 2y + 3) = 0
-4 + -4y + -3y2 + (-8 * -1 + -9y * -1 + 4y2 * -1) + (5y2 + 2y + 3) = 0
-4 + -4y + -3y2 + (8 + 9y + -4y2) + (5y2 + 2y + 3) = 0

Reorder the terms:
-4 + -4y + -3y2 + 8 + 9y + -4y2 + (3 + 2y + 5y2) = 0

Remove parenthesis around (3 + 2y + 5y2)
-4 + -4y + -3y2 + 8 + 9y + -4y2 + 3 + 2y + 5y2 = 0

Reorder the terms:
-4 + 8 + 3 + -4y + 9y + 2y + -3y2 + -4y2 + 5y2 = 0

Combine like terms: -4 + 8 = 4
4 + 3 + -4y + 9y + 2y + -3y2 + -4y2 + 5y2 = 0

Combine like terms: 4 + 3 = 7
7 + -4y + 9y + 2y + -3y2 + -4y2 + 5y2 = 0

Combine like terms: -4y + 9y = 5y
7 + 5y + 2y + -3y2 + -4y2 + 5y2 = 0

Combine like terms: 5y + 2y = 7y
7 + 7y + -3y2 + -4y2 + 5y2 = 0

Combine like terms: -3y2 + -4y2 = -7y2
7 + 7y + -7y2 + 5y2 = 0

Combine like terms: -7y2 + 5y2 = -2y2
7 + 7y + -2y2 = 0

Solving
7 + 7y + -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'.
-3.5 + -3.5y + y2 = 0

Move the constant term to the right:

Add '3.5' to each side of the equation.
-3.5 + -3.5y + 3.5 + y2 = 0 + 3.5

Reorder the terms:
-3.5 + 3.5 + -3.5y + y2 = 0 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + -3.5y + y2 = 0 + 3.5
-3.5y + y2 = 0 + 3.5

Combine like terms: 0 + 3.5 = 3.5
-3.5y + y2 = 3.5

The y term is -3.5y.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5y + 3.0625 + y2 = 3.5 + 3.0625

Reorder the terms:
3.0625 + -3.5y + y2 = 3.5 + 3.0625

Combine like terms: 3.5 + 3.0625 = 6.5625
3.0625 + -3.5y + y2 = 6.5625

Factor a perfect square on the left side:
(y + -1.75)(y + -1.75) = 6.5625

Calculate the square root of the right side: 2.561737691

Break this problem into two subproblems by setting 
(y + -1.75) equal to 2.561737691 and -2.561737691.

Subproblem 1

y + -1.75 = 2.561737691 Simplifying y + -1.75 = 2.561737691 Reorder the terms: -1.75 + y = 2.561737691 Solving -1.75 + y = 2.561737691 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + y = 2.561737691 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + y = 2.561737691 + 1.75 y = 2.561737691 + 1.75 Combine like terms: 2.561737691 + 1.75 = 4.311737691 y = 4.311737691 Simplifying y = 4.311737691

Subproblem 2

y + -1.75 = -2.561737691 Simplifying y + -1.75 = -2.561737691 Reorder the terms: -1.75 + y = -2.561737691 Solving -1.75 + y = -2.561737691 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + y = -2.561737691 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + y = -2.561737691 + 1.75 y = -2.561737691 + 1.75 Combine like terms: -2.561737691 + 1.75 = -0.811737691 y = -0.811737691 Simplifying y = -0.811737691

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.311737691, -0.811737691}

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