- Log rules | logarithm rules - RapidTables. com
For example, in order to calculate log 2 (8) in calculator, we need to change the base to 10: log 2 (8) = log 10 (8) log 10 (2) See: log base change rule Logarithm of negative number The base b real logarithm of x when x<=0 is undefined when x is negative or equal to zero:
- Introduction to Logarithms - Math is Fun
On a calculator it is the "log" button It is how many times we need to use 10 in a multiplication, to get our desired number Example: log(1000) = log 10 (1000) = 3 Natural Logarithms: Base "e" Another base that is often used is e (Euler's Number) which is about 2 71828
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