-y^2-2y=-2

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Solution for -y^2-2y=-2 equation:


Simplifying
-1y2 + -2y = -2

Reorder the terms:
-2y + -1y2 = -2

Solving
-2y + -1y2 = -2

Solving for variable 'y'.

Reorder the terms:
2 + -2y + -1y2 = -2 + 2

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

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

Divide each side by '-1'.
-2 + 2y + y2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + 2y + 2 + y2 = 0 + 2

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

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

Combine like terms: 0 + 2 = 2
2y + y2 = 2

The y term is 2y.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2y + 1 + y2 = 2 + 1

Reorder the terms:
1 + 2y + y2 = 2 + 1

Combine like terms: 2 + 1 = 3
1 + 2y + y2 = 3

Factor a perfect square on the left side:
(y + 1)(y + 1) = 3

Calculate the square root of the right side: 1.732050808

Break this problem into two subproblems by setting 
(y + 1) equal to 1.732050808 and -1.732050808.

Subproblem 1

y + 1 = 1.732050808 Simplifying y + 1 = 1.732050808 Reorder the terms: 1 + y = 1.732050808 Solving 1 + y = 1.732050808 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = 1.732050808 + -1 Combine like terms: 1 + -1 = 0 0 + y = 1.732050808 + -1 y = 1.732050808 + -1 Combine like terms: 1.732050808 + -1 = 0.732050808 y = 0.732050808 Simplifying y = 0.732050808

Subproblem 2

y + 1 = -1.732050808 Simplifying y + 1 = -1.732050808 Reorder the terms: 1 + y = -1.732050808 Solving 1 + y = -1.732050808 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = -1.732050808 + -1 Combine like terms: 1 + -1 = 0 0 + y = -1.732050808 + -1 y = -1.732050808 + -1 Combine like terms: -1.732050808 + -1 = -2.732050808 y = -2.732050808 Simplifying y = -2.732050808

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.732050808, -2.732050808}

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