(3y+5)(9-y)=0

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Solution for (3y+5)(9-y)=0 equation: 


Simplifying
(3y + 5)(9 + -1y) = 0

Reorder the terms:
(5 + 3y)(9 + -1y) = 0

Multiply (5 + 3y) * (9 + -1y)
(5(9 + -1y) + 3y * (9 + -1y)) = 0
((9 * 5 + -1y * 5) + 3y * (9 + -1y)) = 0
((45 + -5y) + 3y * (9 + -1y)) = 0
(45 + -5y + (9 * 3y + -1y * 3y)) = 0
(45 + -5y + (27y + -3y2)) = 0

Combine like terms: -5y + 27y = 22y
(45 + 22y + -3y2) = 0

Solving
45 + 22y + -3y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(9 + -1y)(5 + 3y) = 0


Subproblem 1
Set the factor '(9 + -1y)' equal to zero and attempt to solve:

Simplifying
9 + -1y = 0

Solving
9 + -1y = 0

Move all terms containing y to the left, all other terms to the right.

Add '-9' to each side of the equation.
9 + -9 + -1y = 0 + -9

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

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

Divide each side by '-1'.
y = 9

Simplifying
y = 9

Subproblem 2
Set the factor '(5 + 3y)' equal to zero and attempt to solve:

Simplifying
5 + 3y = 0

Solving
5 + 3y = 0

Move all terms containing y to the left, all other terms to the right.

Add '-5' to each side of the equation.
5 + -5 + 3y = 0 + -5

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

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

Divide each side by '3'.
y = -1.666666667

Simplifying
y = -1.666666667
Solution
y = {9, -1.666666667}

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