11y(2-y)=2(y+1)

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Solution for 11y(2-y)=2(y+1) equation:


Simplifying
11y(2 + -1y) = 2(y + 1)
(2 * 11y + -1y * 11y) = 2(y + 1)
(22y + -11y2) = 2(y + 1)

Reorder the terms:
22y + -11y2 = 2(1 + y)
22y + -11y2 = (1 * 2 + y * 2)
22y + -11y2 = (2 + 2y)

Solving
22y + -11y2 = 2 + 2y

Solving for variable 'y'.

Reorder the terms:
-2 + 22y + -2y + -11y2 = 2 + 2y + -2 + -2y

Combine like terms: 22y + -2y = 20y
-2 + 20y + -11y2 = 2 + 2y + -2 + -2y

Reorder the terms:
-2 + 20y + -11y2 = 2 + -2 + 2y + -2y

Combine like terms: 2 + -2 = 0
-2 + 20y + -11y2 = 0 + 2y + -2y
-2 + 20y + -11y2 = 2y + -2y

Combine like terms: 2y + -2y = 0
-2 + 20y + -11y2 = 0

Begin completing the square.  Divide all terms by
-11 the coefficient of the squared term: 

Divide each side by '-11'.
0.1818181818 + -1.818181818y + y2 = 0

Move the constant term to the right:

Add '-0.1818181818' to each side of the equation.
0.1818181818 + -1.818181818y + -0.1818181818 + y2 = 0 + -0.1818181818

Reorder the terms:
0.1818181818 + -0.1818181818 + -1.818181818y + y2 = 0 + -0.1818181818

Combine like terms: 0.1818181818 + -0.1818181818 = 0.0000000000
0.0000000000 + -1.818181818y + y2 = 0 + -0.1818181818
-1.818181818y + y2 = 0 + -0.1818181818

Combine like terms: 0 + -0.1818181818 = -0.1818181818
-1.818181818y + y2 = -0.1818181818

The y term is -1.818181818y.  Take half its coefficient (-0.909090909).
Square it (0.8264462808) and add it to both sides.

Add '0.8264462808' to each side of the equation.
-1.818181818y + 0.8264462808 + y2 = -0.1818181818 + 0.8264462808

Reorder the terms:
0.8264462808 + -1.818181818y + y2 = -0.1818181818 + 0.8264462808

Combine like terms: -0.1818181818 + 0.8264462808 = 0.644628099
0.8264462808 + -1.818181818y + y2 = 0.644628099

Factor a perfect square on the left side:
(y + -0.909090909)(y + -0.909090909) = 0.644628099

Calculate the square root of the right side: 0.802887351

Break this problem into two subproblems by setting 
(y + -0.909090909) equal to 0.802887351 and -0.802887351.

Subproblem 1

y + -0.909090909 = 0.802887351 Simplifying y + -0.909090909 = 0.802887351 Reorder the terms: -0.909090909 + y = 0.802887351 Solving -0.909090909 + y = 0.802887351 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.909090909' to each side of the equation. -0.909090909 + 0.909090909 + y = 0.802887351 + 0.909090909 Combine like terms: -0.909090909 + 0.909090909 = 0.000000000 0.000000000 + y = 0.802887351 + 0.909090909 y = 0.802887351 + 0.909090909 Combine like terms: 0.802887351 + 0.909090909 = 1.71197826 y = 1.71197826 Simplifying y = 1.71197826

Subproblem 2

y + -0.909090909 = -0.802887351 Simplifying y + -0.909090909 = -0.802887351 Reorder the terms: -0.909090909 + y = -0.802887351 Solving -0.909090909 + y = -0.802887351 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.909090909' to each side of the equation. -0.909090909 + 0.909090909 + y = -0.802887351 + 0.909090909 Combine like terms: -0.909090909 + 0.909090909 = 0.000000000 0.000000000 + y = -0.802887351 + 0.909090909 y = -0.802887351 + 0.909090909 Combine like terms: -0.802887351 + 0.909090909 = 0.106203558 y = 0.106203558 Simplifying y = 0.106203558

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.71197826, 0.106203558}

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