12=y(8+y)

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Solution for 12=y(8+y) equation:


Simplifying
12 = y(8 + y)
12 = (8 * y + y * y)
12 = (8y + y2)

Solving
12 = 8y + y2

Solving for variable 'y'.

Reorder the terms:
12 + -8y + -1y2 = 8y + -8y + y2 + -1y2

Combine like terms: 8y + -8y = 0
12 + -8y + -1y2 = 0 + y2 + -1y2
12 + -8y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
12 + -8y + -1y2 = 0

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

Divide each side by '-1'.
-12 + 8y + y2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 8y + 12 + y2 = 0 + 12

Reorder the terms:
-12 + 12 + 8y + y2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 8y + y2 = 0 + 12
8y + y2 = 0 + 12

Combine like terms: 0 + 12 = 12
8y + y2 = 12

The y term is 8y.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8y + 16 + y2 = 12 + 16

Reorder the terms:
16 + 8y + y2 = 12 + 16

Combine like terms: 12 + 16 = 28
16 + 8y + y2 = 28

Factor a perfect square on the left side:
(y + 4)(y + 4) = 28

Calculate the square root of the right side: 5.291502622

Break this problem into two subproblems by setting 
(y + 4) equal to 5.291502622 and -5.291502622.

Subproblem 1

y + 4 = 5.291502622 Simplifying y + 4 = 5.291502622 Reorder the terms: 4 + y = 5.291502622 Solving 4 + y = 5.291502622 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + y = 5.291502622 + -4 Combine like terms: 4 + -4 = 0 0 + y = 5.291502622 + -4 y = 5.291502622 + -4 Combine like terms: 5.291502622 + -4 = 1.291502622 y = 1.291502622 Simplifying y = 1.291502622

Subproblem 2

y + 4 = -5.291502622 Simplifying y + 4 = -5.291502622 Reorder the terms: 4 + y = -5.291502622 Solving 4 + y = -5.291502622 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + y = -5.291502622 + -4 Combine like terms: 4 + -4 = 0 0 + y = -5.291502622 + -4 y = -5.291502622 + -4 Combine like terms: -5.291502622 + -4 = -9.291502622 y = -9.291502622 Simplifying y = -9.291502622

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.291502622, -9.291502622}

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