3y^2+6y-13=0

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Solution for 3y^2+6y-13=0 equation:


Simplifying
3y2 + 6y + -13 = 0

Reorder the terms:
-13 + 6y + 3y2 = 0

Solving
-13 + 6y + 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'.
-4.333333333 + 2y + y2 = 0

Move the constant term to the right:

Add '4.333333333' to each side of the equation.
-4.333333333 + 2y + 4.333333333 + y2 = 0 + 4.333333333

Reorder the terms:
-4.333333333 + 4.333333333 + 2y + y2 = 0 + 4.333333333

Combine like terms: -4.333333333 + 4.333333333 = 0.000000000
0.000000000 + 2y + y2 = 0 + 4.333333333
2y + y2 = 0 + 4.333333333

Combine like terms: 0 + 4.333333333 = 4.333333333
2y + y2 = 4.333333333

The y term is 2y.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2y + 1 + y2 = 4.333333333 + 1

Reorder the terms:
1 + 2y + y2 = 4.333333333 + 1

Combine like terms: 4.333333333 + 1 = 5.333333333
1 + 2y + y2 = 5.333333333

Factor a perfect square on the left side:
(y + 1)(y + 1) = 5.333333333

Calculate the square root of the right side: 2.309401077

Break this problem into two subproblems by setting 
(y + 1) equal to 2.309401077 and -2.309401077.

Subproblem 1

y + 1 = 2.309401077 Simplifying y + 1 = 2.309401077 Reorder the terms: 1 + y = 2.309401077 Solving 1 + y = 2.309401077 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = 2.309401077 + -1 Combine like terms: 1 + -1 = 0 0 + y = 2.309401077 + -1 y = 2.309401077 + -1 Combine like terms: 2.309401077 + -1 = 1.309401077 y = 1.309401077 Simplifying y = 1.309401077

Subproblem 2

y + 1 = -2.309401077 Simplifying y + 1 = -2.309401077 Reorder the terms: 1 + y = -2.309401077 Solving 1 + y = -2.309401077 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = -2.309401077 + -1 Combine like terms: 1 + -1 = 0 0 + y = -2.309401077 + -1 y = -2.309401077 + -1 Combine like terms: -2.309401077 + -1 = -3.309401077 y = -3.309401077 Simplifying y = -3.309401077

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.309401077, -3.309401077}

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