-y^2-2y+6=0

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Solution for -y^2-2y+6=0 equation:


Simplifying
-1y2 + -2y + 6 = 0

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

Solving
6 + -2y + -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'.
-6 + 2y + y2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + 2y + 6 + y2 = 0 + 6

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

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

Combine like terms: 0 + 6 = 6
2y + y2 = 6

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 = 6 + 1

Reorder the terms:
1 + 2y + y2 = 6 + 1

Combine like terms: 6 + 1 = 7
1 + 2y + y2 = 7

Factor a perfect square on the left side:
(y + 1)(y + 1) = 7

Calculate the square root of the right side: 2.645751311

Break this problem into two subproblems by setting 
(y + 1) equal to 2.645751311 and -2.645751311.

Subproblem 1

y + 1 = 2.645751311 Simplifying y + 1 = 2.645751311 Reorder the terms: 1 + y = 2.645751311 Solving 1 + y = 2.645751311 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 = 2.645751311 + -1 Combine like terms: 1 + -1 = 0 0 + y = 2.645751311 + -1 y = 2.645751311 + -1 Combine like terms: 2.645751311 + -1 = 1.645751311 y = 1.645751311 Simplifying y = 1.645751311

Subproblem 2

y + 1 = -2.645751311 Simplifying y + 1 = -2.645751311 Reorder the terms: 1 + y = -2.645751311 Solving 1 + y = -2.645751311 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 = -2.645751311 + -1 Combine like terms: 1 + -1 = 0 0 + y = -2.645751311 + -1 y = -2.645751311 + -1 Combine like terms: -2.645751311 + -1 = -3.645751311 y = -3.645751311 Simplifying y = -3.645751311

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.645751311, -3.645751311}

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