(5y-9)(4+y)=0

Solution for (5y-9)(4+y)=0 equation:

Simplifying
(5y + -9)(4 + y) = 0

Reorder the terms:
(-9 + 5y)(4 + y) = 0

Multiply (-9 + 5y) * (4 + y)
(-9(4 + y) + 5y * (4 + y)) = 0
((4 * -9 + y * -9) + 5y * (4 + y)) = 0
((-36 + -9y) + 5y * (4 + y)) = 0
(-36 + -9y + (4 * 5y + y * 5y)) = 0
(-36 + -9y + (20y + 5y2)) = 0

Combine like terms: -9y + 20y = 11y
(-36 + 11y + 5y2) = 0

Solving
-36 + 11y + 5y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(-4 + -1y)(9 + -5y) = 0

Subproblem 1
Set the factor '(-4 + -1y)' equal to zero and attempt to solve:

Simplifying
-4 + -1y = 0

Solving
-4 + -1y = 0

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

Add '4' to each side of the equation.
-4 + 4 + -1y = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -1y = 0 + 4
-1y = 0 + 4

Combine like terms: 0 + 4 = 4
-1y = 4

Divide each side by '-1'.
y = -4

Simplifying
y = -4
Subproblem 2
Set the factor '(9 + -5y)' equal to zero and attempt to solve:

Simplifying
9 + -5y = 0

Solving
9 + -5y = 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 + -5y = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -5y = 0 + -9
-5y = 0 + -9

Combine like terms: 0 + -9 = -9
-5y = -9

Divide each side by '-5'.
y = 1.8

Simplifying
y = 1.8
Solution
y = {-4, 1.8}