0=y^2+2y-60

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Solution for 0=y^2+2y-60 equation:


Simplifying
0 = y2 + 2y + -60

Reorder the terms:
0 = -60 + 2y + y2

Solving
0 = -60 + 2y + y2

Solving for variable 'y'.

Combine like terms: 0 + 60 = 60
60 + -2y + -1y2 = -60 + 2y + y2 + 60 + -2y + -1y2

Reorder the terms:
60 + -2y + -1y2 = -60 + 60 + 2y + -2y + y2 + -1y2

Combine like terms: -60 + 60 = 0
60 + -2y + -1y2 = 0 + 2y + -2y + y2 + -1y2
60 + -2y + -1y2 = 2y + -2y + y2 + -1y2

Combine like terms: 2y + -2y = 0
60 + -2y + -1y2 = 0 + y2 + -1y2
60 + -2y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
60 + -2y + -1y2 = 0

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

Divide each side by '-1'.
-60 + 2y + y2 = 0

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + 2y + 60 + y2 = 0 + 60

Reorder the terms:
-60 + 60 + 2y + y2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + 2y + y2 = 0 + 60
2y + y2 = 0 + 60

Combine like terms: 0 + 60 = 60
2y + y2 = 60

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 = 60 + 1

Reorder the terms:
1 + 2y + y2 = 60 + 1

Combine like terms: 60 + 1 = 61
1 + 2y + y2 = 61

Factor a perfect square on the left side:
(y + 1)(y + 1) = 61

Calculate the square root of the right side: 7.810249676

Break this problem into two subproblems by setting 
(y + 1) equal to 7.810249676 and -7.810249676.

Subproblem 1

y + 1 = 7.810249676 Simplifying y + 1 = 7.810249676 Reorder the terms: 1 + y = 7.810249676 Solving 1 + y = 7.810249676 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 = 7.810249676 + -1 Combine like terms: 1 + -1 = 0 0 + y = 7.810249676 + -1 y = 7.810249676 + -1 Combine like terms: 7.810249676 + -1 = 6.810249676 y = 6.810249676 Simplifying y = 6.810249676

Subproblem 2

y + 1 = -7.810249676 Simplifying y + 1 = -7.810249676 Reorder the terms: 1 + y = -7.810249676 Solving 1 + y = -7.810249676 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 = -7.810249676 + -1 Combine like terms: 1 + -1 = 0 0 + y = -7.810249676 + -1 y = -7.810249676 + -1 Combine like terms: -7.810249676 + -1 = -8.810249676 y = -8.810249676 Simplifying y = -8.810249676

Solution

The solution to the problem is based on the solutions from the subproblems. y = {6.810249676, -8.810249676}

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