0=2y^2-11y-5

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Solution for 0=2y^2-11y-5 equation:


Simplifying
0 = 2y2 + -11y + -5

Reorder the terms:
0 = -5 + -11y + 2y2

Solving
0 = -5 + -11y + 2y2

Solving for variable 'y'.

Combine like terms: 0 + 5 = 5
5 + 11y + -2y2 = -5 + -11y + 2y2 + 5 + 11y + -2y2

Reorder the terms:
5 + 11y + -2y2 = -5 + 5 + -11y + 11y + 2y2 + -2y2

Combine like terms: -5 + 5 = 0
5 + 11y + -2y2 = 0 + -11y + 11y + 2y2 + -2y2
5 + 11y + -2y2 = -11y + 11y + 2y2 + -2y2

Combine like terms: -11y + 11y = 0
5 + 11y + -2y2 = 0 + 2y2 + -2y2
5 + 11y + -2y2 = 2y2 + -2y2

Combine like terms: 2y2 + -2y2 = 0
5 + 11y + -2y2 = 0

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

Divide each side by '-2'.
-2.5 + -5.5y + y2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -5.5y + 2.5 + y2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -5.5y + y2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -5.5y + y2 = 0 + 2.5
-5.5y + y2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-5.5y + y2 = 2.5

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 = 2.5 + 7.5625

Reorder the terms:
7.5625 + -5.5y + y2 = 2.5 + 7.5625

Combine like terms: 2.5 + 7.5625 = 10.0625
7.5625 + -5.5y + y2 = 10.0625

Factor a perfect square on the left side:
(y + -2.75)(y + -2.75) = 10.0625

Calculate the square root of the right side: 3.172144385

Break this problem into two subproblems by setting 
(y + -2.75) equal to 3.172144385 and -3.172144385.

Subproblem 1

y + -2.75 = 3.172144385 Simplifying y + -2.75 = 3.172144385 Reorder the terms: -2.75 + y = 3.172144385 Solving -2.75 + y = 3.172144385 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 = 3.172144385 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + y = 3.172144385 + 2.75 y = 3.172144385 + 2.75 Combine like terms: 3.172144385 + 2.75 = 5.922144385 y = 5.922144385 Simplifying y = 5.922144385

Subproblem 2

y + -2.75 = -3.172144385 Simplifying y + -2.75 = -3.172144385 Reorder the terms: -2.75 + y = -3.172144385 Solving -2.75 + y = -3.172144385 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 = -3.172144385 + 2.75 Combine like terms: -2.75 + 2.75 = 0.00 0.00 + y = -3.172144385 + 2.75 y = -3.172144385 + 2.75 Combine like terms: -3.172144385 + 2.75 = -0.422144385 y = -0.422144385 Simplifying y = -0.422144385

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.922144385, -0.422144385}

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