2y^2+11y+3=0

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Solution for 2y^2+11y+3=0 equation:


Simplifying
2y2 + 11y + 3 = 0

Reorder the terms:
3 + 11y + 2y2 = 0

Solving
3 + 11y + 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 + 5.5y + y2 = 0

Move the constant term to the right:

Add '-1.5' to each side of the equation.
1.5 + 5.5y + -1.5 + y2 = 0 + -1.5

Reorder the terms:
1.5 + -1.5 + 5.5y + y2 = 0 + -1.5

Combine like terms: 1.5 + -1.5 = 0.0
0.0 + 5.5y + y2 = 0 + -1.5
5.5y + y2 = 0 + -1.5

Combine like terms: 0 + -1.5 = -1.5
5.5y + y2 = -1.5

The y term is 5.5y.  Take half its coefficient (2.75).
Square it (7.5625) and add it to both sides.

Add '7.5625' to each side of the equation.
5.5y + 7.5625 + y2 = -1.5 + 7.5625

Reorder the terms:
7.5625 + 5.5y + y2 = -1.5 + 7.5625

Combine like terms: -1.5 + 7.5625 = 6.0625
7.5625 + 5.5y + y2 = 6.0625

Factor a perfect square on the left side:
(y + 2.75)(y + 2.75) = 6.0625

Calculate the square root of the right side: 2.46221445

Break this problem into two subproblems by setting 
(y + 2.75) equal to 2.46221445 and -2.46221445.

Subproblem 1

y + 2.75 = 2.46221445 Simplifying y + 2.75 = 2.46221445 Reorder the terms: 2.75 + y = 2.46221445 Solving 2.75 + y = 2.46221445 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.75' to each side of the equation. 2.75 + -2.75 + y = 2.46221445 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + y = 2.46221445 + -2.75 y = 2.46221445 + -2.75 Combine like terms: 2.46221445 + -2.75 = -0.28778555 y = -0.28778555 Simplifying y = -0.28778555

Subproblem 2

y + 2.75 = -2.46221445 Simplifying y + 2.75 = -2.46221445 Reorder the terms: 2.75 + y = -2.46221445 Solving 2.75 + y = -2.46221445 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.75' to each side of the equation. 2.75 + -2.75 + y = -2.46221445 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + y = -2.46221445 + -2.75 y = -2.46221445 + -2.75 Combine like terms: -2.46221445 + -2.75 = -5.21221445 y = -5.21221445 Simplifying y = -5.21221445

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.28778555, -5.21221445}

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