y^2+4y=108

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Solution for y^2+4y=108 equation:


Simplifying
y2 + 4y = 108

Reorder the terms:
4y + y2 = 108

Solving
4y + y2 = 108

Solving for variable 'y'.

Reorder the terms:
-108 + 4y + y2 = 108 + -108

Combine like terms: 108 + -108 = 0
-108 + 4y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '108' to each side of the equation.
-108 + 4y + 108 + y2 = 0 + 108

Reorder the terms:
-108 + 108 + 4y + y2 = 0 + 108

Combine like terms: -108 + 108 = 0
0 + 4y + y2 = 0 + 108
4y + y2 = 0 + 108

Combine like terms: 0 + 108 = 108
4y + y2 = 108

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 = 108 + 4

Reorder the terms:
4 + 4y + y2 = 108 + 4

Combine like terms: 108 + 4 = 112
4 + 4y + y2 = 112

Factor a perfect square on the left side:
(y + 2)(y + 2) = 112

Calculate the square root of the right side: 10.583005244

Break this problem into two subproblems by setting 
(y + 2) equal to 10.583005244 and -10.583005244.

Subproblem 1

y + 2 = 10.583005244 Simplifying y + 2 = 10.583005244 Reorder the terms: 2 + y = 10.583005244 Solving 2 + y = 10.583005244 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 = 10.583005244 + -2 Combine like terms: 2 + -2 = 0 0 + y = 10.583005244 + -2 y = 10.583005244 + -2 Combine like terms: 10.583005244 + -2 = 8.583005244 y = 8.583005244 Simplifying y = 8.583005244

Subproblem 2

y + 2 = -10.583005244 Simplifying y + 2 = -10.583005244 Reorder the terms: 2 + y = -10.583005244 Solving 2 + y = -10.583005244 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 = -10.583005244 + -2 Combine like terms: 2 + -2 = 0 0 + y = -10.583005244 + -2 y = -10.583005244 + -2 Combine like terms: -10.583005244 + -2 = -12.583005244 y = -12.583005244 Simplifying y = -12.583005244

Solution

The solution to the problem is based on the solutions from the subproblems. y = {8.583005244, -12.583005244}

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