What is logarithm property?
The logarithm of a number is the exponent by which another fixed value, the base , has to be raised to produce that number. its properties are
Property 1: 
because 
because Property 2: 
because 
because Property 3: 
because 
.
because .The above rules are the same for all positive bases. The most common bases are the base 10 and the base e. Logarithms with a base 10 are called common logarithms, and logarithms with a base e are natural logarithms.