y(y+6)=12

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Solution for y(y+6)=12 equation:


Simplifying
y(y + 6) = 12

Reorder the terms:
y(6 + y) = 12
(6 * y + y * y) = 12
(6y + y2) = 12

Solving
6y + y2 = 12

Solving for variable 'y'.

Reorder the terms:
-12 + 6y + y2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + 6y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 6y + 12 + y2 = 0 + 12

Reorder the terms:
-12 + 12 + 6y + y2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 6y + y2 = 0 + 12
6y + y2 = 0 + 12

Combine like terms: 0 + 12 = 12
6y + y2 = 12

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 = 12 + 9

Reorder the terms:
9 + 6y + y2 = 12 + 9

Combine like terms: 12 + 9 = 21
9 + 6y + y2 = 21

Factor a perfect square on the left side:
(y + 3)(y + 3) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(y + 3) equal to 4.582575695 and -4.582575695.

Subproblem 1

y + 3 = 4.582575695 Simplifying y + 3 = 4.582575695 Reorder the terms: 3 + y = 4.582575695 Solving 3 + y = 4.582575695 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 = 4.582575695 + -3 Combine like terms: 3 + -3 = 0 0 + y = 4.582575695 + -3 y = 4.582575695 + -3 Combine like terms: 4.582575695 + -3 = 1.582575695 y = 1.582575695 Simplifying y = 1.582575695

Subproblem 2

y + 3 = -4.582575695 Simplifying y + 3 = -4.582575695 Reorder the terms: 3 + y = -4.582575695 Solving 3 + y = -4.582575695 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 = -4.582575695 + -3 Combine like terms: 3 + -3 = 0 0 + y = -4.582575695 + -3 y = -4.582575695 + -3 Combine like terms: -4.582575695 + -3 = -7.582575695 y = -7.582575695 Simplifying y = -7.582575695

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.582575695, -7.582575695}

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