y^2+6y-108=0

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Solution for y^2+6y-108=0 equation:


Simplifying
y2 + 6y + -108 = 0

Reorder the terms:
-108 + 6y + y2 = 0

Solving
-108 + 6y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '108' to each side of the equation.
-108 + 6y + 108 + y2 = 0 + 108

Reorder the terms:
-108 + 108 + 6y + y2 = 0 + 108

Combine like terms: -108 + 108 = 0
0 + 6y + y2 = 0 + 108
6y + y2 = 0 + 108

Combine like terms: 0 + 108 = 108
6y + y2 = 108

The y term is 6y.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6y + 9 + y2 = 108 + 9

Reorder the terms:
9 + 6y + y2 = 108 + 9

Combine like terms: 108 + 9 = 117
9 + 6y + y2 = 117

Factor a perfect square on the left side:
(y + 3)(y + 3) = 117

Calculate the square root of the right side: 10.816653826

Break this problem into two subproblems by setting 
(y + 3) equal to 10.816653826 and -10.816653826.

Subproblem 1

y + 3 = 10.816653826 Simplifying y + 3 = 10.816653826 Reorder the terms: 3 + y = 10.816653826 Solving 3 + y = 10.816653826 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + y = 10.816653826 + -3 Combine like terms: 3 + -3 = 0 0 + y = 10.816653826 + -3 y = 10.816653826 + -3 Combine like terms: 10.816653826 + -3 = 7.816653826 y = 7.816653826 Simplifying y = 7.816653826

Subproblem 2

y + 3 = -10.816653826 Simplifying y + 3 = -10.816653826 Reorder the terms: 3 + y = -10.816653826 Solving 3 + y = -10.816653826 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + y = -10.816653826 + -3 Combine like terms: 3 + -3 = 0 0 + y = -10.816653826 + -3 y = -10.816653826 + -3 Combine like terms: -10.816653826 + -3 = -13.816653826 y = -13.816653826 Simplifying y = -13.816653826

Solution

The solution to the problem is based on the solutions from the subproblems. y = {7.816653826, -13.816653826}

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