## Prealgebra (7th Edition)

To factor this polynomial, we must factor out the GCF (greatest common factor). With 3 and 15, the GCF is 3. With y$^2$ and y, the GCF is simply "y." The GCF is therefore 3y. Now, write each term as a product of the GCF (3y). 3y$^2$ - 15y = 3y(y) - 3y(5) As both of the terms have a 3y, we can factor out a 3y from this expression: 3y(y - 5)