y^2+2y-36=0

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Solution for y^2+2y-36=0 equation:


Simplifying
y2 + 2y + -36 = 0

Reorder the terms:
-36 + 2y + y2 = 0

Solving
-36 + 2y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '36' to each side of the equation.
-36 + 2y + 36 + y2 = 0 + 36

Reorder the terms:
-36 + 36 + 2y + y2 = 0 + 36

Combine like terms: -36 + 36 = 0
0 + 2y + y2 = 0 + 36
2y + y2 = 0 + 36

Combine like terms: 0 + 36 = 36
2y + y2 = 36

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 = 36 + 1

Reorder the terms:
1 + 2y + y2 = 36 + 1

Combine like terms: 36 + 1 = 37
1 + 2y + y2 = 37

Factor a perfect square on the left side:
(y + 1)(y + 1) = 37

Calculate the square root of the right side: 6.08276253

Break this problem into two subproblems by setting 
(y + 1) equal to 6.08276253 and -6.08276253.

Subproblem 1

y + 1 = 6.08276253 Simplifying y + 1 = 6.08276253 Reorder the terms: 1 + y = 6.08276253 Solving 1 + y = 6.08276253 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 = 6.08276253 + -1 Combine like terms: 1 + -1 = 0 0 + y = 6.08276253 + -1 y = 6.08276253 + -1 Combine like terms: 6.08276253 + -1 = 5.08276253 y = 5.08276253 Simplifying y = 5.08276253

Subproblem 2

y + 1 = -6.08276253 Simplifying y + 1 = -6.08276253 Reorder the terms: 1 + y = -6.08276253 Solving 1 + y = -6.08276253 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 = -6.08276253 + -1 Combine like terms: 1 + -1 = 0 0 + y = -6.08276253 + -1 y = -6.08276253 + -1 Combine like terms: -6.08276253 + -1 = -7.08276253 y = -7.08276253 Simplifying y = -7.08276253

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.08276253, -7.08276253}

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