2y^2+11=10y

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


Simplifying
2y2 + 11 = 10y

Reorder the terms:
11 + 2y2 = 10y

Solving
11 + 2y2 = 10y

Solving for variable 'y'.

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

Combine like terms: 10y + -10y = 0
11 + -10y + 2y2 = 0

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

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

Combine like terms: 5.5 + -5.5 = 0.0
0.0 + -5y + y2 = 0 + -5.5
-5y + y2 = 0 + -5.5

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

The y term is -5y.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5y + 6.25 + y2 = -5.5 + 6.25

Reorder the terms:
6.25 + -5y + y2 = -5.5 + 6.25

Combine like terms: -5.5 + 6.25 = 0.75
6.25 + -5y + y2 = 0.75

Factor a perfect square on the left side:
(y + -2.5)(y + -2.5) = 0.75

Calculate the square root of the right side: 0.866025404

Break this problem into two subproblems by setting 
(y + -2.5) equal to 0.866025404 and -0.866025404.

Subproblem 1

y + -2.5 = 0.866025404 Simplifying y + -2.5 = 0.866025404 Reorder the terms: -2.5 + y = 0.866025404 Solving -2.5 + y = 0.866025404 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y = 0.866025404 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = 0.866025404 + 2.5 y = 0.866025404 + 2.5 Combine like terms: 0.866025404 + 2.5 = 3.366025404 y = 3.366025404 Simplifying y = 3.366025404

Subproblem 2

y + -2.5 = -0.866025404 Simplifying y + -2.5 = -0.866025404 Reorder the terms: -2.5 + y = -0.866025404 Solving -2.5 + y = -0.866025404 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y = -0.866025404 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = -0.866025404 + 2.5 y = -0.866025404 + 2.5 Combine like terms: -0.866025404 + 2.5 = 1.633974596 y = 1.633974596 Simplifying y = 1.633974596

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.366025404, 1.633974596}

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