The number on top is the original polynomial you have to find all the factors for. The number below that is the result of dividing that by the known factors. This program is in base X. See Polynomial Calculator for an explanation.
Note: There appears to be a bug which results in factors not being recognized properly. If this happens, click the green flag a couple times. This can also occur with the program not asking you correctly. Note: Your factors should not be factorable themselves.