5.2 Logarithms

5.2 Logarithms

N = a x log a N = x log a N = x is called the logarithmic form and N = a x is the index or exponential form.



Note:
  1. The logarithm of a negative number is not defined.
  2. log in the calculator denotes log 10 or common logarithm.
  3. log 10 may be written as lg.
  4. If the base is other than 10, the base should be specified, e.g. log 3 81