Logarithm formula sheet Laws of Logarithms First Law of the logarithms logarithm addition rule Log of product Sum of Logs log a m n log a m log a n. 0 formulas included in custom cheat sheet. The formula for the log of e comes from the formula for the power of one e 1 e.
Note that the requirement that x 0 x 0 is really a result of the fact that we are also requiring b 0 b 0.
Log a x lna lnx 1. X would have to be 4. The logarithm of number b on the base a log a b is defined as an exponent in which it is necessary raise number a to gain number b The logarithm exists only at positive numbers. Also see how Exponents Roots and Logarithms are related.