3y^2+1y=9

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


Simplifying
3y2 + 1y = 9

Reorder the terms:
1y + 3y2 = 9

Solving
1y + 3y2 = 9

Solving for variable 'y'.

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

Combine like terms: 9 + -9 = 0
-9 + 1y + 3y2 = 0

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

Divide each side by '3'.
-3 + 0.3333333333y + y2 = 0

Move the constant term to the right:

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

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

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

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

The y term is 0.3333333333y.  Take half its coefficient (0.1666666667).
Square it (0.02777777779) and add it to both sides.

Add '0.02777777779' to each side of the equation.
0.3333333333y + 0.02777777779 + y2 = 3 + 0.02777777779

Reorder the terms:
0.02777777779 + 0.3333333333y + y2 = 3 + 0.02777777779

Combine like terms: 3 + 0.02777777779 = 3.02777777779
0.02777777779 + 0.3333333333y + y2 = 3.02777777779

Factor a perfect square on the left side:
(y + 0.1666666667)(y + 0.1666666667) = 3.02777777779

Calculate the square root of the right side: 1.740051085

Break this problem into two subproblems by setting 
(y + 0.1666666667) equal to 1.740051085 and -1.740051085.

Subproblem 1

y + 0.1666666667 = 1.740051085 Simplifying y + 0.1666666667 = 1.740051085 Reorder the terms: 0.1666666667 + y = 1.740051085 Solving 0.1666666667 + y = 1.740051085 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.1666666667' to each side of the equation. 0.1666666667 + -0.1666666667 + y = 1.740051085 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + y = 1.740051085 + -0.1666666667 y = 1.740051085 + -0.1666666667 Combine like terms: 1.740051085 + -0.1666666667 = 1.5733844183 y = 1.5733844183 Simplifying y = 1.5733844183

Subproblem 2

y + 0.1666666667 = -1.740051085 Simplifying y + 0.1666666667 = -1.740051085 Reorder the terms: 0.1666666667 + y = -1.740051085 Solving 0.1666666667 + y = -1.740051085 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.1666666667' to each side of the equation. 0.1666666667 + -0.1666666667 + y = -1.740051085 + -0.1666666667 Combine like terms: 0.1666666667 + -0.1666666667 = 0.0000000000 0.0000000000 + y = -1.740051085 + -0.1666666667 y = -1.740051085 + -0.1666666667 Combine like terms: -1.740051085 + -0.1666666667 = -1.9067177517 y = -1.9067177517 Simplifying y = -1.9067177517

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.5733844183, -1.9067177517}

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