3y^2+4y=240

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Solution for 3y^2+4y=240 equation:


Simplifying
3y2 + 4y = 240

Reorder the terms:
4y + 3y2 = 240

Solving
4y + 3y2 = 240

Solving for variable 'y'.

Reorder the terms:
-240 + 4y + 3y2 = 240 + -240

Combine like terms: 240 + -240 = 0
-240 + 4y + 3y2 = 0

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

Divide each side by '3'.
-80 + 1.333333333y + y2 = 0

Move the constant term to the right:

Add '80' to each side of the equation.
-80 + 1.333333333y + 80 + y2 = 0 + 80

Reorder the terms:
-80 + 80 + 1.333333333y + y2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + 1.333333333y + y2 = 0 + 80
1.333333333y + y2 = 0 + 80

Combine like terms: 0 + 80 = 80
1.333333333y + y2 = 80

The y term is 1.333333333y.  Take half its coefficient (0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
1.333333333y + 0.4444444442 + y2 = 80 + 0.4444444442

Reorder the terms:
0.4444444442 + 1.333333333y + y2 = 80 + 0.4444444442

Combine like terms: 80 + 0.4444444442 = 80.4444444442
0.4444444442 + 1.333333333y + y2 = 80.4444444442

Factor a perfect square on the left side:
(y + 0.6666666665)(y + 0.6666666665) = 80.4444444442

Calculate the square root of the right side: 8.969082698

Break this problem into two subproblems by setting 
(y + 0.6666666665) equal to 8.969082698 and -8.969082698.

Subproblem 1

y + 0.6666666665 = 8.969082698 Simplifying y + 0.6666666665 = 8.969082698 Reorder the terms: 0.6666666665 + y = 8.969082698 Solving 0.6666666665 + y = 8.969082698 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.6666666665' to each side of the equation. 0.6666666665 + -0.6666666665 + y = 8.969082698 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + y = 8.969082698 + -0.6666666665 y = 8.969082698 + -0.6666666665 Combine like terms: 8.969082698 + -0.6666666665 = 8.3024160315 y = 8.3024160315 Simplifying y = 8.3024160315

Subproblem 2

y + 0.6666666665 = -8.969082698 Simplifying y + 0.6666666665 = -8.969082698 Reorder the terms: 0.6666666665 + y = -8.969082698 Solving 0.6666666665 + y = -8.969082698 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.6666666665' to each side of the equation. 0.6666666665 + -0.6666666665 + y = -8.969082698 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + y = -8.969082698 + -0.6666666665 y = -8.969082698 + -0.6666666665 Combine like terms: -8.969082698 + -0.6666666665 = -9.6357493645 y = -9.6357493645 Simplifying y = -9.6357493645

Solution

The solution to the problem is based on the solutions from the subproblems. y = {8.3024160315, -9.6357493645}

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