Sounds like a disaster movie, but it’s just my latest screencast. In it, I explain how to use logarithms to analyze earthquakes using the Richter scale, and the acidity of solutions using the pH scale.

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Sounds like a disaster movie, but it’s just my latest screencast. In it, I explain how to use logarithms to analyze earthquakes using the Richter scale, and the acidity of solutions using the pH scale.

Once you realize that logarithms are exponents, all the properties of logarithms should make sense. Whatever rules exponents follow, logarithms will also obey. This screencast explains it in more detail:

Logarithms. The word can strike terror in the hearts of algebra and precalculus students everywhere. However, once you understand their secret, there is nothing to fear. Logarithms are simply powers of numbers. They’re exponents! For example, when you ask yourself, “What power of 3 would give me 81?”, and you answer “4”, you just figured out a logarithm. 4 is the log of 81, base 3.

See? That wasn’t so scary, was it? Now watch my latest screencast to learn more about these misunderstand numbers.