in that picture is a practice problem from a site I am using. I have highlighted the part of it that is confusing me.
In the picture, if f(u) = 2^u , then how does f ' (u) = (2^u)*ln(2) ???
I understand the chain rule aspect of the problem, but I have no clue where that "ln" came from or what rule that is. I understand ln is a natural log, which is Log Base e... though I have no idea why it was introduced into the problem as part of the deriavtive
I have been searching online for the past hour and can not figure this out.
(I would be posting a question as simple as this on YahooAnswers, but YahooAnswers has stopped working for some reason =\)