As mentioned earlier there are two common bases used in logarithmic
functions. The first one is base 10 or common logarthims. This is
what you find on your calculator. When we write logarithms to the
base 10 we normally do not include the 10.
Log10 x means log x
The other common base is e, or the natural logarithm. The number
e is a irrational constant equal to 2.718 281 …
When we write a natural logarithm we use the following:
 this
is the same as writing logex
Resource
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Interactive Mathematics to learn more about where natural
logarithms and the number e came from.
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