(3+y)(3y+8)=8

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Solution for (3+y)(3y+8)=8 equation:


Simplifying
(3 + y)(3y + 8) = 8

Reorder the terms:
(3 + y)(8 + 3y) = 8

Multiply (3 + y) * (8 + 3y)
(3(8 + 3y) + y(8 + 3y)) = 8
((8 * 3 + 3y * 3) + y(8 + 3y)) = 8
((24 + 9y) + y(8 + 3y)) = 8
(24 + 9y + (8 * y + 3y * y)) = 8
(24 + 9y + (8y + 3y2)) = 8

Combine like terms: 9y + 8y = 17y
(24 + 17y + 3y2) = 8

Solving
24 + 17y + 3y2 = 8

Solving for variable 'y'.

Reorder the terms:
24 + -8 + 17y + 3y2 = 8 + -8

Combine like terms: 24 + -8 = 16
16 + 17y + 3y2 = 8 + -8

Combine like terms: 8 + -8 = 0
16 + 17y + 3y2 = 0

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

Divide each side by '3'.
5.333333333 + 5.666666667y + y2 = 0

Move the constant term to the right:

Add '-5.333333333' to each side of the equation.
5.333333333 + 5.666666667y + -5.333333333 + y2 = 0 + -5.333333333

Reorder the terms:
5.333333333 + -5.333333333 + 5.666666667y + y2 = 0 + -5.333333333

Combine like terms: 5.333333333 + -5.333333333 = 0.000000000
0.000000000 + 5.666666667y + y2 = 0 + -5.333333333
5.666666667y + y2 = 0 + -5.333333333

Combine like terms: 0 + -5.333333333 = -5.333333333
5.666666667y + y2 = -5.333333333

The y term is 5.666666667y.  Take half its coefficient (2.833333334).
Square it (8.027777782) and add it to both sides.

Add '8.027777782' to each side of the equation.
5.666666667y + 8.027777782 + y2 = -5.333333333 + 8.027777782

Reorder the terms:
8.027777782 + 5.666666667y + y2 = -5.333333333 + 8.027777782

Combine like terms: -5.333333333 + 8.027777782 = 2.694444449
8.027777782 + 5.666666667y + y2 = 2.694444449

Factor a perfect square on the left side:
(y + 2.833333334)(y + 2.833333334) = 2.694444449

Calculate the square root of the right side: 1.641476302

Break this problem into two subproblems by setting 
(y + 2.833333334) equal to 1.641476302 and -1.641476302.

Subproblem 1

y + 2.833333334 = 1.641476302 Simplifying y + 2.833333334 = 1.641476302 Reorder the terms: 2.833333334 + y = 1.641476302 Solving 2.833333334 + y = 1.641476302 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.833333334' to each side of the equation. 2.833333334 + -2.833333334 + y = 1.641476302 + -2.833333334 Combine like terms: 2.833333334 + -2.833333334 = 0.000000000 0.000000000 + y = 1.641476302 + -2.833333334 y = 1.641476302 + -2.833333334 Combine like terms: 1.641476302 + -2.833333334 = -1.191857032 y = -1.191857032 Simplifying y = -1.191857032

Subproblem 2

y + 2.833333334 = -1.641476302 Simplifying y + 2.833333334 = -1.641476302 Reorder the terms: 2.833333334 + y = -1.641476302 Solving 2.833333334 + y = -1.641476302 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.833333334' to each side of the equation. 2.833333334 + -2.833333334 + y = -1.641476302 + -2.833333334 Combine like terms: 2.833333334 + -2.833333334 = 0.000000000 0.000000000 + y = -1.641476302 + -2.833333334 y = -1.641476302 + -2.833333334 Combine like terms: -1.641476302 + -2.833333334 = -4.474809636 y = -4.474809636 Simplifying y = -4.474809636

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-1.191857032, -4.474809636}

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