Quandaries
and Queries 

Janea is my name. Im in the 10th grade and i'm a student. What is the answer to 1. (n+17)(n+7)=0 What is the answer to:2. (y15)(y100)=0 

Hi Janea, The number zero has a very special property that is useful here. Suppose I tell you that I have two numbers p and q and that pq = 12. There are many choices for p and q. They might be 2 and 6 or 3 and 4 or 1 and 12 or many other choices if you allow fractions. If however I tell you that I have two numbers p and q and that pq = 0 then you have much more information. If pq = 0 then either p = 0 or q = 0 or perhaps both p and q are zero. Thus for question 1, since (n+17)(n+7) = 0 you know that
Penny 

