2y^2+12y+1=0

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Solution for 2y^2+12y+1=0 equation:


Simplifying
2y2 + 12y + 1 = 0

Reorder the terms:
1 + 12y + 2y2 = 0

Solving
1 + 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'.
0.5 + 6y + y2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + 6y + -0.5 + y2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + 6y + y2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + 6y + y2 = 0 + -0.5
6y + y2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
6y + y2 = -0.5

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 = -0.5 + 9

Reorder the terms:
9 + 6y + y2 = -0.5 + 9

Combine like terms: -0.5 + 9 = 8.5
9 + 6y + y2 = 8.5

Factor a perfect square on the left side:
(y + 3)(y + 3) = 8.5

Calculate the square root of the right side: 2.915475947

Break this problem into two subproblems by setting 
(y + 3) equal to 2.915475947 and -2.915475947.

Subproblem 1

y + 3 = 2.915475947 Simplifying y + 3 = 2.915475947 Reorder the terms: 3 + y = 2.915475947 Solving 3 + y = 2.915475947 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 = 2.915475947 + -3 Combine like terms: 3 + -3 = 0 0 + y = 2.915475947 + -3 y = 2.915475947 + -3 Combine like terms: 2.915475947 + -3 = -0.084524053 y = -0.084524053 Simplifying y = -0.084524053

Subproblem 2

y + 3 = -2.915475947 Simplifying y + 3 = -2.915475947 Reorder the terms: 3 + y = -2.915475947 Solving 3 + y = -2.915475947 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 = -2.915475947 + -3 Combine like terms: 3 + -3 = 0 0 + y = -2.915475947 + -3 y = -2.915475947 + -3 Combine like terms: -2.915475947 + -3 = -5.915475947 y = -5.915475947 Simplifying y = -5.915475947

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.084524053, -5.915475947}

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