2y^2+11y+10=0

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Solution for 2y^2+11y+10=0 equation:


Simplifying
2y2 + 11y + 10 = 0

Reorder the terms:
10 + 11y + 2y2 = 0

Solving
10 + 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'.
5 + 5.5y + y2 = 0

Move the constant term to the right:

Add '-5' to each side of the equation.
5 + 5.5y + -5 + y2 = 0 + -5

Reorder the terms:
5 + -5 + 5.5y + y2 = 0 + -5

Combine like terms: 5 + -5 = 0
0 + 5.5y + y2 = 0 + -5
5.5y + y2 = 0 + -5

Combine like terms: 0 + -5 = -5
5.5y + y2 = -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 = -5 + 7.5625

Reorder the terms:
7.5625 + 5.5y + y2 = -5 + 7.5625

Combine like terms: -5 + 7.5625 = 2.5625
7.5625 + 5.5y + y2 = 2.5625

Factor a perfect square on the left side:
(y + 2.75)(y + 2.75) = 2.5625

Calculate the square root of the right side: 1.600781059

Break this problem into two subproblems by setting 
(y + 2.75) equal to 1.600781059 and -1.600781059.

Subproblem 1

y + 2.75 = 1.600781059 Simplifying y + 2.75 = 1.600781059 Reorder the terms: 2.75 + y = 1.600781059 Solving 2.75 + y = 1.600781059 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 = 1.600781059 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + y = 1.600781059 + -2.75 y = 1.600781059 + -2.75 Combine like terms: 1.600781059 + -2.75 = -1.149218941 y = -1.149218941 Simplifying y = -1.149218941

Subproblem 2

y + 2.75 = -1.600781059 Simplifying y + 2.75 = -1.600781059 Reorder the terms: 2.75 + y = -1.600781059 Solving 2.75 + y = -1.600781059 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 = -1.600781059 + -2.75 Combine like terms: 2.75 + -2.75 = 0.00 0.00 + y = -1.600781059 + -2.75 y = -1.600781059 + -2.75 Combine like terms: -1.600781059 + -2.75 = -4.350781059 y = -4.350781059 Simplifying y = -4.350781059

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-1.149218941, -4.350781059}

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