(3y+4)(y+3)=20

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Solution for (3y+4)(y+3)=20 equation:


Simplifying
(3y + 4)(y + 3) = 20

Reorder the terms:
(4 + 3y)(y + 3) = 20

Reorder the terms:
(4 + 3y)(3 + y) = 20

Multiply (4 + 3y) * (3 + y)
(4(3 + y) + 3y * (3 + y)) = 20
((3 * 4 + y * 4) + 3y * (3 + y)) = 20
((12 + 4y) + 3y * (3 + y)) = 20
(12 + 4y + (3 * 3y + y * 3y)) = 20
(12 + 4y + (9y + 3y2)) = 20

Combine like terms: 4y + 9y = 13y
(12 + 13y + 3y2) = 20

Solving
12 + 13y + 3y2 = 20

Solving for variable 'y'.

Reorder the terms:
12 + -20 + 13y + 3y2 = 20 + -20

Combine like terms: 12 + -20 = -8
-8 + 13y + 3y2 = 20 + -20

Combine like terms: 20 + -20 = 0
-8 + 13y + 3y2 = 0

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

Divide each side by '3'.
-2.666666667 + 4.333333333y + y2 = 0

Move the constant term to the right:

Add '2.666666667' to each side of the equation.
-2.666666667 + 4.333333333y + 2.666666667 + y2 = 0 + 2.666666667

Reorder the terms:
-2.666666667 + 2.666666667 + 4.333333333y + y2 = 0 + 2.666666667

Combine like terms: -2.666666667 + 2.666666667 = 0.000000000
0.000000000 + 4.333333333y + y2 = 0 + 2.666666667
4.333333333y + y2 = 0 + 2.666666667

Combine like terms: 0 + 2.666666667 = 2.666666667
4.333333333y + y2 = 2.666666667

The y term is 4.333333333y.  Take half its coefficient (2.166666667).
Square it (4.694444446) and add it to both sides.

Add '4.694444446' to each side of the equation.
4.333333333y + 4.694444446 + y2 = 2.666666667 + 4.694444446

Reorder the terms:
4.694444446 + 4.333333333y + y2 = 2.666666667 + 4.694444446

Combine like terms: 2.666666667 + 4.694444446 = 7.361111113
4.694444446 + 4.333333333y + y2 = 7.361111113

Factor a perfect square on the left side:
(y + 2.166666667)(y + 2.166666667) = 7.361111113

Calculate the square root of the right side: 2.713136766

Break this problem into two subproblems by setting 
(y + 2.166666667) equal to 2.713136766 and -2.713136766.

Subproblem 1

y + 2.166666667 = 2.713136766 Simplifying y + 2.166666667 = 2.713136766 Reorder the terms: 2.166666667 + y = 2.713136766 Solving 2.166666667 + y = 2.713136766 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.166666667' to each side of the equation. 2.166666667 + -2.166666667 + y = 2.713136766 + -2.166666667 Combine like terms: 2.166666667 + -2.166666667 = 0.000000000 0.000000000 + y = 2.713136766 + -2.166666667 y = 2.713136766 + -2.166666667 Combine like terms: 2.713136766 + -2.166666667 = 0.546470099 y = 0.546470099 Simplifying y = 0.546470099

Subproblem 2

y + 2.166666667 = -2.713136766 Simplifying y + 2.166666667 = -2.713136766 Reorder the terms: 2.166666667 + y = -2.713136766 Solving 2.166666667 + y = -2.713136766 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.166666667' to each side of the equation. 2.166666667 + -2.166666667 + y = -2.713136766 + -2.166666667 Combine like terms: 2.166666667 + -2.166666667 = 0.000000000 0.000000000 + y = -2.713136766 + -2.166666667 y = -2.713136766 + -2.166666667 Combine like terms: -2.713136766 + -2.166666667 = -4.879803433 y = -4.879803433 Simplifying y = -4.879803433

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.546470099, -4.879803433}

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