3y^2-12y-8=0

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Solution for 3y^2-12y-8=0 equation:


Simplifying
3y2 + -12y + -8 = 0

Reorder the terms:
-8 + -12y + 3y2 = 0

Solving
-8 + -12y + 3y2 = 0

Solving for variable 'y'.

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

Divide each side by '3'.
-2.666666667 + -4y + y2 = 0

Move the constant term to the right:

Add '2.666666667' to each side of the equation.
-2.666666667 + -4y + 2.666666667 + y2 = 0 + 2.666666667

Reorder the terms:
-2.666666667 + 2.666666667 + -4y + y2 = 0 + 2.666666667

Combine like terms: -2.666666667 + 2.666666667 = 0.000000000
0.000000000 + -4y + y2 = 0 + 2.666666667
-4y + y2 = 0 + 2.666666667

Combine like terms: 0 + 2.666666667 = 2.666666667
-4y + y2 = 2.666666667

The y term is -4y.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4y + 4 + y2 = 2.666666667 + 4

Reorder the terms:
4 + -4y + y2 = 2.666666667 + 4

Combine like terms: 2.666666667 + 4 = 6.666666667
4 + -4y + y2 = 6.666666667

Factor a perfect square on the left side:
(y + -2)(y + -2) = 6.666666667

Calculate the square root of the right side: 2.581988898

Break this problem into two subproblems by setting 
(y + -2) equal to 2.581988898 and -2.581988898.

Subproblem 1

y + -2 = 2.581988898 Simplifying y + -2 = 2.581988898 Reorder the terms: -2 + y = 2.581988898 Solving -2 + y = 2.581988898 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = 2.581988898 + 2 Combine like terms: -2 + 2 = 0 0 + y = 2.581988898 + 2 y = 2.581988898 + 2 Combine like terms: 2.581988898 + 2 = 4.581988898 y = 4.581988898 Simplifying y = 4.581988898

Subproblem 2

y + -2 = -2.581988898 Simplifying y + -2 = -2.581988898 Reorder the terms: -2 + y = -2.581988898 Solving -2 + y = -2.581988898 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + y = -2.581988898 + 2 Combine like terms: -2 + 2 = 0 0 + y = -2.581988898 + 2 y = -2.581988898 + 2 Combine like terms: -2.581988898 + 2 = -0.581988898 y = -0.581988898 Simplifying y = -0.581988898

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.581988898, -0.581988898}

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