−45y^2+40y

To factor the expression -45y^2 + 40y, we need to find the greatest common factor of the terms.

The GCF of -45y^2 and 40y is 5y.

So, we can factor out 5y from the expression:

-45y^2 + 40y
= 5y(-9y + 8)

Therefore, the factored form of the expression -45y^2 + 40y is 5y(-9y + 8).