(-4y^2+5y-2)+(3y^2+6y+1)=0

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Solution for (-4y^2+5y-2)+(3y^2+6y+1)=0 equation:


Simplifying
(-4y2 + 5y + -2) + (3y2 + 6y + 1) = 0

Reorder the terms:
(-2 + 5y + -4y2) + (3y2 + 6y + 1) = 0

Remove parenthesis around (-2 + 5y + -4y2)
-2 + 5y + -4y2 + (3y2 + 6y + 1) = 0

Reorder the terms:
-2 + 5y + -4y2 + (1 + 6y + 3y2) = 0

Remove parenthesis around (1 + 6y + 3y2)
-2 + 5y + -4y2 + 1 + 6y + 3y2 = 0

Reorder the terms:
-2 + 1 + 5y + 6y + -4y2 + 3y2 = 0

Combine like terms: -2 + 1 = -1
-1 + 5y + 6y + -4y2 + 3y2 = 0

Combine like terms: 5y + 6y = 11y
-1 + 11y + -4y2 + 3y2 = 0

Combine like terms: -4y2 + 3y2 = -1y2
-1 + 11y + -1y2 = 0

Solving
-1 + 11y + -1y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
1 + -11y + y2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -11y + -1 + y2 = 0 + -1

Reorder the terms:
1 + -1 + -11y + y2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -11y + y2 = 0 + -1
-11y + y2 = 0 + -1

Combine like terms: 0 + -1 = -1
-11y + y2 = -1

The y term is -11y.  Take half its coefficient (-5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
-11y + 30.25 + y2 = -1 + 30.25

Reorder the terms:
30.25 + -11y + y2 = -1 + 30.25

Combine like terms: -1 + 30.25 = 29.25
30.25 + -11y + y2 = 29.25

Factor a perfect square on the left side:
(y + -5.5)(y + -5.5) = 29.25

Calculate the square root of the right side: 5.408326913

Break this problem into two subproblems by setting 
(y + -5.5) equal to 5.408326913 and -5.408326913.

Subproblem 1

y + -5.5 = 5.408326913 Simplifying y + -5.5 = 5.408326913 Reorder the terms: -5.5 + y = 5.408326913 Solving -5.5 + y = 5.408326913 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + y = 5.408326913 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + y = 5.408326913 + 5.5 y = 5.408326913 + 5.5 Combine like terms: 5.408326913 + 5.5 = 10.908326913 y = 10.908326913 Simplifying y = 10.908326913

Subproblem 2

y + -5.5 = -5.408326913 Simplifying y + -5.5 = -5.408326913 Reorder the terms: -5.5 + y = -5.408326913 Solving -5.5 + y = -5.408326913 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + y = -5.408326913 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + y = -5.408326913 + 5.5 y = -5.408326913 + 5.5 Combine like terms: -5.408326913 + 5.5 = 0.091673087 y = 0.091673087 Simplifying y = 0.091673087

Solution

The solution to the problem is based on the solutions from the subproblems. y = {10.908326913, 0.091673087}

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