Here, an expression with logarithms is simplified. It’s good to watch the pencast “exponents… the rules” for background information.
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This pencast was very helpful for going over a few basic rules for logs and exponents. There are a few sections in the middle where there is no sound, but nothing is missed in the lesson/explanation. I would recommend reviewing this pencast prior to dealing with logs and exponents and changing them from one to the other.