(9-y)(5y-8)=0

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Solution for (9-y)(5y-8)=0 equation: 


Simplifying
(9 + -1y)(5y + -8) = 0

Reorder the terms:
(9 + -1y)(-8 + 5y) = 0

Multiply (9 + -1y) * (-8 + 5y)
(9(-8 + 5y) + -1y * (-8 + 5y)) = 0
((-8 * 9 + 5y * 9) + -1y * (-8 + 5y)) = 0
((-72 + 45y) + -1y * (-8 + 5y)) = 0
(-72 + 45y + (-8 * -1y + 5y * -1y)) = 0
(-72 + 45y + (8y + -5y2)) = 0

Combine like terms: 45y + 8y = 53y
(-72 + 53y + -5y2) = 0

Solving
-72 + 53y + -5y2 = 0

Solving for variable 'y'.

Factor a trinomial.
(-9 + y)(8 + -5y) = 0


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

Simplifying
-9 + y = 0

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

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

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

Simplifying
y = 9

Subproblem 2
Set the factor '(8 + -5y)' equal to zero and attempt to solve:

Simplifying
8 + -5y = 0

Solving
8 + -5y = 0

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

Add '-8' to each side of the equation.
8 + -8 + -5y = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -5y = 0 + -8
-5y = 0 + -8

Combine like terms: 0 + -8 = -8
-5y = -8

Divide each side by '-5'.
y = 1.6

Simplifying
y = 1.6
Solution
y = {9, 1.6}

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