Posted by jess on Tuesday, June 12, 2012 at 1:52pm.
Solve x = log3 15

math equations  Steve, Tuesday, June 12, 2012 at 2:20pm
huh? there's nothing to solve. Just evaluate log3 15.
Now, you probably don't have a logbase3 key on your calculator, so you have to use what you do have: ln
x = ln15/ln3
How does that work? By definition,
3^log3 15 = 15
ln(3^log3 15) = ln15
now, ln(3^p) = p*ln3, so we have
log3 15 * ln3 = ln15
log3 15 = ln15/ln3
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