Change of base formula:



The  is 2 and the  is either 10 or e, take your pick:

If we pick 10 for the , then


becomes


When the base is 10 we don't write the 10 but leave it understood:


Then we cet a calculator and find those logarithms with the LOG key:

--------------------------------------------
If we pick e for the , then


becomes


When the base is e we don't write  but write  instead:


Then we cet a calculator and find those natural logarithms with the LN key:


Notice that regardless of whether we picked 10 or e for the ,
we ended up with the same answer.

Edwin