Factor completely x2 + 25.
a) (x + 5)(x + 5)
b) (x + 5)(x − 5)
c) (x − 5)(x − 5)
d) prime

We'd divide. 

This is because:

Gallons are much more than cups. If we cant to convert cups to gallons, we divide to get a smaller unit. 

Example: There are 32 cups on the table. How many gallons are there?

32/amount of cups per gallon
32/16 = 2

2 gallons,