3y^2+9y-1=0

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Solution for 3y^2+9y-1=0 equation:


Simplifying
3y2 + 9y + -1 = 0

Reorder the terms:
-1 + 9y + 3y2 = 0

Solving
-1 + 9y + 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'.
-0.3333333333 + 3y + y2 = 0

Move the constant term to the right:

Add '0.3333333333' to each side of the equation.
-0.3333333333 + 3y + 0.3333333333 + y2 = 0 + 0.3333333333

Reorder the terms:
-0.3333333333 + 0.3333333333 + 3y + y2 = 0 + 0.3333333333

Combine like terms: -0.3333333333 + 0.3333333333 = 0.0000000000
0.0000000000 + 3y + y2 = 0 + 0.3333333333
3y + y2 = 0 + 0.3333333333

Combine like terms: 0 + 0.3333333333 = 0.3333333333
3y + y2 = 0.3333333333

The y term is 3y.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3y + 2.25 + y2 = 0.3333333333 + 2.25

Reorder the terms:
2.25 + 3y + y2 = 0.3333333333 + 2.25

Combine like terms: 0.3333333333 + 2.25 = 2.5833333333
2.25 + 3y + y2 = 2.5833333333

Factor a perfect square on the left side:
(y + 1.5)(y + 1.5) = 2.5833333333

Calculate the square root of the right side: 1.607275127

Break this problem into two subproblems by setting 
(y + 1.5) equal to 1.607275127 and -1.607275127.

Subproblem 1

y + 1.5 = 1.607275127 Simplifying y + 1.5 = 1.607275127 Reorder the terms: 1.5 + y = 1.607275127 Solving 1.5 + y = 1.607275127 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + y = 1.607275127 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + y = 1.607275127 + -1.5 y = 1.607275127 + -1.5 Combine like terms: 1.607275127 + -1.5 = 0.107275127 y = 0.107275127 Simplifying y = 0.107275127

Subproblem 2

y + 1.5 = -1.607275127 Simplifying y + 1.5 = -1.607275127 Reorder the terms: 1.5 + y = -1.607275127 Solving 1.5 + y = -1.607275127 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + y = -1.607275127 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + y = -1.607275127 + -1.5 y = -1.607275127 + -1.5 Combine like terms: -1.607275127 + -1.5 = -3.107275127 y = -3.107275127 Simplifying y = -3.107275127

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.107275127, -3.107275127}

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