My text asks me to describe why it is I cannot put a negative base into a logarithm, and I can't figure why. I can see how it would cause problems, what with -2^3 won't give you a positive eight....? I don't get it. It seems to me that it could work out sometimes, but the text clearly states, "You cannot have a negative base". Thats all it says though. I reckon it assumes I should know, or it should be blatantly obvious, but I don't get it. Any thoughts?