-y^2+4y+4=0

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Solution for -y^2+4y+4=0 equation: 


Simplifying
-1y2 + 4y + 4 = 0

Reorder the terms:
4 + 4y + -1y2 = 0

Solving
4 + 4y + -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'.
-4 + -4y + y2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -4y + 4 + y2 = 0 + 4

Reorder the terms:
-4 + 4 + -4y + y2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -4y + y2 = 0 + 4
-4y + y2 = 0 + 4

Combine like terms: 0 + 4 = 4
-4y + y2 = 4

The y term is -4y.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4y + 4 + y2 = 4 + 4

Reorder the terms:
4 + -4y + y2 = 4 + 4

Combine like terms: 4 + 4 = 8
4 + -4y + y2 = 8

Factor a perfect square on the left side:
(y + -2)(y + -2) = 8

Calculate the square root of the right side: 2.828427125

Break this problem into two subproblems by setting 
(y + -2) equal to 2.828427125 and -2.828427125.


Subproblem 1
y + -2 = 2.828427125

Simplifying
y + -2 = 2.828427125

Reorder the terms:
-2 + y = 2.828427125

Solving
-2 + y = 2.828427125

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '2' to each side of the equation.
-2 + 2 + y = 2.828427125 + 2

Combine like terms: -2 + 2 = 0
0 + y = 2.828427125 + 2
y = 2.828427125 + 2

Combine like terms: 2.828427125 + 2 = 4.828427125
y = 4.828427125

Simplifying
y = 4.828427125


Subproblem 2
y + -2 = -2.828427125

Simplifying
y + -2 = -2.828427125

Reorder the terms:
-2 + y = -2.828427125

Solving
-2 + y = -2.828427125

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '2' to each side of the equation.
-2 + 2 + y = -2.828427125 + 2

Combine like terms: -2 + 2 = 0
0 + y = -2.828427125 + 2
y = -2.828427125 + 2

Combine like terms: -2.828427125 + 2 = -0.828427125
y = -0.828427125

Simplifying
y = -0.828427125


Solution
The solution to the problem is based on the solutions
from the subproblems.
y = {4.828427125, -0.828427125}

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