Change of Base Formula Logarithms

I start with examples of evaluating log expressions that don't require a calculator, then compare that with a problem that does require the change of base formula. Here are my other PreCalculus lessons involving Logarithms http://www.profrobbob.com/pre-calculus/exponential-functions-and-logarithms Check out http://www.ProfRobBob.com, there you will find my lessons organized by class/subject and then by topics within each class. Find free review test, useful notes and more at http://www.mathplane.com If you'd like to make a donation to support my efforts look for the "Tip the Teacher" button on my channel's homepage www.YouTube.com/Profrobbob