Hello metallica007The log of a number to a certain base is that power to which the base must be raised in order to get the number.In other words, if
then the log of to base is . So when we raise to the power we get . In other words:Make sure you can get your mind around that!
The laws of logs (whatever the base) are:... (1)Now to your question. Note first that . So we get:
, using law (2) aboveGrandad
, using the definition of a log