3y^2+5y=64

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Solution for 3y^2+5y=64 equation:


Simplifying
3y2 + 5y = 64

Reorder the terms:
5y + 3y2 = 64

Solving
5y + 3y2 = 64

Solving for variable 'y'.

Reorder the terms:
-64 + 5y + 3y2 = 64 + -64

Combine like terms: 64 + -64 = 0
-64 + 5y + 3y2 = 0

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

Divide each side by '3'.
-21.33333333 + 1.666666667y + y2 = 0

Move the constant term to the right:

Add '21.33333333' to each side of the equation.
-21.33333333 + 1.666666667y + 21.33333333 + y2 = 0 + 21.33333333

Reorder the terms:
-21.33333333 + 21.33333333 + 1.666666667y + y2 = 0 + 21.33333333

Combine like terms: -21.33333333 + 21.33333333 = 0.00000000
0.00000000 + 1.666666667y + y2 = 0 + 21.33333333
1.666666667y + y2 = 0 + 21.33333333

Combine like terms: 0 + 21.33333333 = 21.33333333
1.666666667y + y2 = 21.33333333

The y term is 1.666666667y.  Take half its coefficient (0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
1.666666667y + 0.6944444447 + y2 = 21.33333333 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667y + y2 = 21.33333333 + 0.6944444447

Combine like terms: 21.33333333 + 0.6944444447 = 22.0277777747
0.6944444447 + 1.666666667y + y2 = 22.0277777747

Factor a perfect square on the left side:
(y + 0.8333333335)(y + 0.8333333335) = 22.0277777747

Calculate the square root of the right side: 4.693375946

Break this problem into two subproblems by setting 
(y + 0.8333333335) equal to 4.693375946 and -4.693375946.

Subproblem 1

y + 0.8333333335 = 4.693375946 Simplifying y + 0.8333333335 = 4.693375946 Reorder the terms: 0.8333333335 + y = 4.693375946 Solving 0.8333333335 + y = 4.693375946 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + y = 4.693375946 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + y = 4.693375946 + -0.8333333335 y = 4.693375946 + -0.8333333335 Combine like terms: 4.693375946 + -0.8333333335 = 3.8600426125 y = 3.8600426125 Simplifying y = 3.8600426125

Subproblem 2

y + 0.8333333335 = -4.693375946 Simplifying y + 0.8333333335 = -4.693375946 Reorder the terms: 0.8333333335 + y = -4.693375946 Solving 0.8333333335 + y = -4.693375946 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + y = -4.693375946 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + y = -4.693375946 + -0.8333333335 y = -4.693375946 + -0.8333333335 Combine like terms: -4.693375946 + -0.8333333335 = -5.5267092795 y = -5.5267092795 Simplifying y = -5.5267092795

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.8600426125, -5.5267092795}

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