I could have just tried out numbers whose product is negative 16, and I probably would have tried out four and negative four in not too much time, and then I would have been able to maybe figure out that it's lower than if I did two and negative eight, or negative two and eight, or one and 16, and that's true. You probably would have been able to do that, but you still wouldn't have been able to feel good that that was a minimum value, because you wouldn't have tried out 4.01 or 4.0011. In fact, you couldn't have tried out all of the possible values. Remember, we didn't say that this is only integers. It just happened to be that our values worked out to be, just worked out to be integers in this situation. You can imagine what would happen if the problem wasn't if their product is negative 16, but what if their product is negative 17, or what if their product is negative 16.5, or what if their product was pi squared? Then you wouldn't be able to try everything else out, and you would have to resort to doing what we did in this video.