Properties
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Change of Base Property
The Change of Base Property allows you to solve logs with a calculator when you cannot use mental math or conversion to exponential form. Since most scientific calculators only calculate common log 
and natural log 
, there will be times when it is necessary to change bases in order to calculate a log function.
The Change of Base Property states:
This is not a property that needs to be memorized; it can be found using the properties you have already learned as shown in the following example.
and natural log , there will be times when it is necessary to change bases in order to calculate a log function. The Change of Base Property states:
This is not a property that needs to be memorized; it can be found using the properties you have already learned as shown in the following example.