2y^2+12y+3=0

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Solution for 2y^2+12y+3=0 equation:


Simplifying
2y2 + 12y + 3 = 0

Reorder the terms:
3 + 12y + 2y2 = 0

Solving
3 + 12y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
1.5 + 6y + y2 = 0

Move the constant term to the right:

Add '-1.5' to each side of the equation.
1.5 + 6y + -1.5 + y2 = 0 + -1.5

Reorder the terms:
1.5 + -1.5 + 6y + y2 = 0 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + 6y + y2 = 0 + -1.5
6y + y2 = 0 + -1.5

Combine like terms: 0 + -1.5 = -1.5
6y + y2 = -1.5

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 = -1.5 + 9

Reorder the terms:
9 + 6y + y2 = -1.5 + 9

Combine like terms: -1.5 + 9 = 7.5
9 + 6y + y2 = 7.5

Factor a perfect square on the left side:
(y + 3)(y + 3) = 7.5

Calculate the square root of the right side: 2.738612788

Break this problem into two subproblems by setting 
(y + 3) equal to 2.738612788 and -2.738612788.

Subproblem 1

y + 3 = 2.738612788 Simplifying y + 3 = 2.738612788 Reorder the terms: 3 + y = 2.738612788 Solving 3 + y = 2.738612788 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 = 2.738612788 + -3 Combine like terms: 3 + -3 = 0 0 + y = 2.738612788 + -3 y = 2.738612788 + -3 Combine like terms: 2.738612788 + -3 = -0.261387212 y = -0.261387212 Simplifying y = -0.261387212

Subproblem 2

y + 3 = -2.738612788 Simplifying y + 3 = -2.738612788 Reorder the terms: 3 + y = -2.738612788 Solving 3 + y = -2.738612788 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 = -2.738612788 + -3 Combine like terms: 3 + -3 = 0 0 + y = -2.738612788 + -3 y = -2.738612788 + -3 Combine like terms: -2.738612788 + -3 = -5.738612788 y = -5.738612788 Simplifying y = -5.738612788

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.261387212, -5.738612788}

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