Originally Posted by

**Jhevon** yes, those are three of the four log rules that you MUST know. with those you should be able to do any log problem. When i tutor people at school i usually give them like 10 or so rules to memorize, it makes life a lot easier on them to just know those rules and apply them, but all the rules can be derived from the first four.

in case you are wondering, the fourth law which i mentioned (which really should be the first law, since it is the definition of a logarithm) is:

The logarithm of a number to a given base, is the power to which the base must be raised to give the number. That is,

If $\displaystyle \log_a b = c$,

then $\displaystyle a^c = b$