(-6y^2+5y-2)+(y^2+3y+7)=

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Solution for (-6y^2+5y-2)+(y^2+3y+7)= equation:


Simplifying
(-6y2 + 5y + -2) + (y2 + 3y + 7) = 0

Reorder the terms:
(-2 + 5y + -6y2) + (y2 + 3y + 7) = 0

Remove parenthesis around (-2 + 5y + -6y2)
-2 + 5y + -6y2 + (y2 + 3y + 7) = 0

Reorder the terms:
-2 + 5y + -6y2 + (7 + 3y + y2) = 0

Remove parenthesis around (7 + 3y + y2)
-2 + 5y + -6y2 + 7 + 3y + y2 = 0

Reorder the terms:
-2 + 7 + 5y + 3y + -6y2 + y2 = 0

Combine like terms: -2 + 7 = 5
5 + 5y + 3y + -6y2 + y2 = 0

Combine like terms: 5y + 3y = 8y
5 + 8y + -6y2 + y2 = 0

Combine like terms: -6y2 + y2 = -5y2
5 + 8y + -5y2 = 0

Solving
5 + 8y + -5y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-1 + -1.6y + y2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -1.6y + 1 + y2 = 0 + 1

Reorder the terms:
-1 + 1 + -1.6y + y2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -1.6y + y2 = 0 + 1
-1.6y + y2 = 0 + 1

Combine like terms: 0 + 1 = 1
-1.6y + y2 = 1

The y term is -1.6y.  Take half its coefficient (-0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
-1.6y + 0.64 + y2 = 1 + 0.64

Reorder the terms:
0.64 + -1.6y + y2 = 1 + 0.64

Combine like terms: 1 + 0.64 = 1.64
0.64 + -1.6y + y2 = 1.64

Factor a perfect square on the left side:
(y + -0.8)(y + -0.8) = 1.64

Calculate the square root of the right side: 1.280624847

Break this problem into two subproblems by setting 
(y + -0.8) equal to 1.280624847 and -1.280624847.

Subproblem 1

y + -0.8 = 1.280624847 Simplifying y + -0.8 = 1.280624847 Reorder the terms: -0.8 + y = 1.280624847 Solving -0.8 + y = 1.280624847 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + y = 1.280624847 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + y = 1.280624847 + 0.8 y = 1.280624847 + 0.8 Combine like terms: 1.280624847 + 0.8 = 2.080624847 y = 2.080624847 Simplifying y = 2.080624847

Subproblem 2

y + -0.8 = -1.280624847 Simplifying y + -0.8 = -1.280624847 Reorder the terms: -0.8 + y = -1.280624847 Solving -0.8 + y = -1.280624847 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.8' to each side of the equation. -0.8 + 0.8 + y = -1.280624847 + 0.8 Combine like terms: -0.8 + 0.8 = 0.0 0.0 + y = -1.280624847 + 0.8 y = -1.280624847 + 0.8 Combine like terms: -1.280624847 + 0.8 = -0.480624847 y = -0.480624847 Simplifying y = -0.480624847

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.080624847, -0.480624847}

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