Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I don't really understand the Logarithms concept when it comes to question with ln or log with base e.for example question like this:

1.solve the equation $$x^4\mathrm{e}^{-2\ln(x)}=18-3x$$

share|cite|improve this question
is the equation you want to solve $x^4\mathrm{e}^{-2\ln(x)}=18-3x$? You have a symbol that can not be decoded. – Chinny84 Jul 7 '14 at 10:03
yes, i've tried but it turned out like that. sorry. – Mirra Jul 7 '14 at 10:06

use the property of the logarithm: $a \log x = \log x^a$, and then the definition: $e^{\ln x} = x$

share|cite|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.