Therefore, the roots become minus B by A minus B by A minus epsilon and minus B by A plus B by A plus epsilon, this is negative, but this is positive. So, I end up having one positive number, I cannot have it. Therefore, C by A has to be negative, that is point number one. Two this of course, is obvious B by A B by A obviously, has to be your, this thing, here the B by A, what B by A should be, now B by A has two choice positive and negative.