0=y^2+2y+-12

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Solution for 0=y^2+2y+-12 equation:


Simplifying
0 = y2 + 2y + -12

Reorder the terms:
0 = -12 + 2y + y2

Solving
0 = -12 + 2y + y2

Solving for variable 'y'.

Combine like terms: 0 + 12 = 12
12 + -2y + -1y2 = -12 + 2y + y2 + 12 + -2y + -1y2

Reorder the terms:
12 + -2y + -1y2 = -12 + 12 + 2y + -2y + y2 + -1y2

Combine like terms: -12 + 12 = 0
12 + -2y + -1y2 = 0 + 2y + -2y + y2 + -1y2
12 + -2y + -1y2 = 2y + -2y + y2 + -1y2

Combine like terms: 2y + -2y = 0
12 + -2y + -1y2 = 0 + y2 + -1y2
12 + -2y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
12 + -2y + -1y2 = 0

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

Divide each side by '-1'.
-12 + 2y + y2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 2y + 12 + y2 = 0 + 12

Reorder the terms:
-12 + 12 + 2y + y2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 2y + y2 = 0 + 12
2y + y2 = 0 + 12

Combine like terms: 0 + 12 = 12
2y + y2 = 12

The y term is 2y.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2y + 1 + y2 = 12 + 1

Reorder the terms:
1 + 2y + y2 = 12 + 1

Combine like terms: 12 + 1 = 13
1 + 2y + y2 = 13

Factor a perfect square on the left side:
(y + 1)(y + 1) = 13

Calculate the square root of the right side: 3.605551275

Break this problem into two subproblems by setting 
(y + 1) equal to 3.605551275 and -3.605551275.

Subproblem 1

y + 1 = 3.605551275 Simplifying y + 1 = 3.605551275 Reorder the terms: 1 + y = 3.605551275 Solving 1 + y = 3.605551275 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = 3.605551275 + -1 Combine like terms: 1 + -1 = 0 0 + y = 3.605551275 + -1 y = 3.605551275 + -1 Combine like terms: 3.605551275 + -1 = 2.605551275 y = 2.605551275 Simplifying y = 2.605551275

Subproblem 2

y + 1 = -3.605551275 Simplifying y + 1 = -3.605551275 Reorder the terms: 1 + y = -3.605551275 Solving 1 + y = -3.605551275 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = -3.605551275 + -1 Combine like terms: 1 + -1 = 0 0 + y = -3.605551275 + -1 y = -3.605551275 + -1 Combine like terms: -3.605551275 + -1 = -4.605551275 y = -4.605551275 Simplifying y = -4.605551275

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.605551275, -4.605551275}

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