20-3y(2+2y)=1

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Solution for 20-3y(2+2y)=1 equation:


Simplifying
20 + -3y(2 + 2y) = 1
20 + (2 * -3y + 2y * -3y) = 1
20 + (-6y + -6y2) = 1

Solving
20 + -6y + -6y2 = 1

Solving for variable 'y'.

Reorder the terms:
20 + -1 + -6y + -6y2 = 1 + -1

Combine like terms: 20 + -1 = 19
19 + -6y + -6y2 = 1 + -1

Combine like terms: 1 + -1 = 0
19 + -6y + -6y2 = 0

Begin completing the square.  Divide all terms by
-6 the coefficient of the squared term: 

Divide each side by '-6'.
-3.166666667 + y + y2 = 0

Move the constant term to the right:

Add '3.166666667' to each side of the equation.
-3.166666667 + y + 3.166666667 + y2 = 0 + 3.166666667

Reorder the terms:
-3.166666667 + 3.166666667 + y + y2 = 0 + 3.166666667

Combine like terms: -3.166666667 + 3.166666667 = 0.000000000
0.000000000 + y + y2 = 0 + 3.166666667
y + y2 = 0 + 3.166666667

Combine like terms: 0 + 3.166666667 = 3.166666667
y + y2 = 3.166666667

The y term is y.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + y2 = 3.166666667 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + y2 = 3.166666667 + 0.25

Combine like terms: 3.166666667 + 0.25 = 3.416666667
1.25 + y2 = 3.416666667

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 3.416666667

Calculate the square root of the right side: 1.848422751

Break this problem into two subproblems by setting 
(y + 0.5) equal to 1.848422751 and -1.848422751.

Subproblem 1

y + 0.5 = 1.848422751 Simplifying y + 0.5 = 1.848422751 Reorder the terms: 0.5 + y = 1.848422751 Solving 0.5 + y = 1.848422751 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = 1.848422751 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 1.848422751 + -0.5 y = 1.848422751 + -0.5 Combine like terms: 1.848422751 + -0.5 = 1.348422751 y = 1.348422751 Simplifying y = 1.348422751

Subproblem 2

y + 0.5 = -1.848422751 Simplifying y + 0.5 = -1.848422751 Reorder the terms: 0.5 + y = -1.848422751 Solving 0.5 + y = -1.848422751 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = -1.848422751 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -1.848422751 + -0.5 y = -1.848422751 + -0.5 Combine like terms: -1.848422751 + -0.5 = -2.348422751 y = -2.348422751 Simplifying y = -2.348422751

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.348422751, -2.348422751}

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