Or at least I think I do...
These are the two problems I have:
...so I basically just need to know what equals, and just plugging in numbers isn't very practical Can anyone help?
take the log of both sides
but now, one of the log rules says that
so and so just divide by 4 and x=
in general though, people seem to like to reduce logs for no reason that I can see... so log4= so x=
divide by 4 and log(x-4)=4, now raise each side to a power of 10, so
so x-4=10000, and x=10004