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

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


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

Reorder the terms:
3y(-1 + 3y) + -3(2y) = 2
(-1 * 3y + 3y * 3y) + -3(2y) = 2
(-3y + 9y2) + -3(2y) = 2

Remove parenthesis around (2y)
-3y + 9y2 + -3 * 2y = 2

Multiply -3 * 2
-3y + 9y2 + -6y = 2

Reorder the terms:
-3y + -6y + 9y2 = 2

Combine like terms: -3y + -6y = -9y
-9y + 9y2 = 2

Solving
-9y + 9y2 = 2

Solving for variable 'y'.

Reorder the terms:
-2 + -9y + 9y2 = 2 + -2

Combine like terms: 2 + -2 = 0
-2 + -9y + 9y2 = 0

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

Divide each side by '9'.
-0.2222222222 + -1y + y2 = 0

Move the constant term to the right:

Add '0.2222222222' to each side of the equation.
-0.2222222222 + -1y + 0.2222222222 + y2 = 0 + 0.2222222222

Reorder the terms:
-0.2222222222 + 0.2222222222 + -1y + y2 = 0 + 0.2222222222

Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000
0.0000000000 + -1y + y2 = 0 + 0.2222222222
-1y + y2 = 0 + 0.2222222222

Combine like terms: 0 + 0.2222222222 = 0.2222222222
-1y + y2 = 0.2222222222

The y term is -1y.  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.
-1y + 0.25 + y2 = 0.2222222222 + 0.25

Reorder the terms:
0.25 + -1y + y2 = 0.2222222222 + 0.25

Combine like terms: 0.2222222222 + 0.25 = 0.4722222222
0.25 + -1y + y2 = 0.4722222222

Factor a perfect square on the left side:
(y + -0.5)(y + -0.5) = 0.4722222222

Calculate the square root of the right side: 0.687184271

Break this problem into two subproblems by setting 
(y + -0.5) equal to 0.687184271 and -0.687184271.

Subproblem 1

y + -0.5 = 0.687184271 Simplifying y + -0.5 = 0.687184271 Reorder the terms: -0.5 + y = 0.687184271 Solving -0.5 + y = 0.687184271 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 = 0.687184271 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = 0.687184271 + 0.5 y = 0.687184271 + 0.5 Combine like terms: 0.687184271 + 0.5 = 1.187184271 y = 1.187184271 Simplifying y = 1.187184271

Subproblem 2

y + -0.5 = -0.687184271 Simplifying y + -0.5 = -0.687184271 Reorder the terms: -0.5 + y = -0.687184271 Solving -0.5 + y = -0.687184271 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 = -0.687184271 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + y = -0.687184271 + 0.5 y = -0.687184271 + 0.5 Combine like terms: -0.687184271 + 0.5 = -0.187184271 y = -0.187184271 Simplifying y = -0.187184271

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.187184271, -0.187184271}

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