posted by George on .
I asked this yesterday but I was told my answer was incorrect by my professor.
ln x^5 - ln x^2 = 3 solve for the unknown.
I have reviewed my Log laws but yet I still cannot figure out what the answers are. The question asks for me to write all answers as a comma separated list. can anyone please help?
You must be talking about this post, which Steve answered.
I would do it exactly the same way, and get the same answer.
Don't know why your prof told you it was wrong..
Here is another way to do it:
using log(A/B) = logA - logB
ln x^5 - ln x^2 = 3
ln (x^5/x^2) = 3
log x^3 = 3
3logx = 3
log x = 1
x = e^1 = e
same answer as before.