9y^2+36y-124=0

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Solution for 9y^2+36y-124=0 equation:


Simplifying
9y2 + 36y + -124 = 0

Reorder the terms:
-124 + 36y + 9y2 = 0

Solving
-124 + 36y + 9y2 = 0

Solving for variable 'y'.

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

Divide each side by '9'.
-13.77777778 + 4y + y2 = 0

Move the constant term to the right:

Add '13.77777778' to each side of the equation.
-13.77777778 + 4y + 13.77777778 + y2 = 0 + 13.77777778

Reorder the terms:
-13.77777778 + 13.77777778 + 4y + y2 = 0 + 13.77777778

Combine like terms: -13.77777778 + 13.77777778 = 0.00000000
0.00000000 + 4y + y2 = 0 + 13.77777778
4y + y2 = 0 + 13.77777778

Combine like terms: 0 + 13.77777778 = 13.77777778
4y + y2 = 13.77777778

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 = 13.77777778 + 4

Reorder the terms:
4 + 4y + y2 = 13.77777778 + 4

Combine like terms: 13.77777778 + 4 = 17.77777778
4 + 4y + y2 = 17.77777778

Factor a perfect square on the left side:
(y + 2)(y + 2) = 17.77777778

Calculate the square root of the right side: 4.216370214

Break this problem into two subproblems by setting 
(y + 2) equal to 4.216370214 and -4.216370214.

Subproblem 1

y + 2 = 4.216370214 Simplifying y + 2 = 4.216370214 Reorder the terms: 2 + y = 4.216370214 Solving 2 + y = 4.216370214 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 = 4.216370214 + -2 Combine like terms: 2 + -2 = 0 0 + y = 4.216370214 + -2 y = 4.216370214 + -2 Combine like terms: 4.216370214 + -2 = 2.216370214 y = 2.216370214 Simplifying y = 2.216370214

Subproblem 2

y + 2 = -4.216370214 Simplifying y + 2 = -4.216370214 Reorder the terms: 2 + y = -4.216370214 Solving 2 + y = -4.216370214 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 = -4.216370214 + -2 Combine like terms: 2 + -2 = 0 0 + y = -4.216370214 + -2 y = -4.216370214 + -2 Combine like terms: -4.216370214 + -2 = -6.216370214 y = -6.216370214 Simplifying y = -6.216370214

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.216370214, -6.216370214}

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