# Math Help - [SOLVED] Find Critical Points

1. ## [SOLVED] Find Critical Points

$f(x)={ln(2x)}/{x} ;[1,e]$
Find the critical points
I used the quotient rule and got
$f'(x)= {-ln(2x)}/{x^{2}}$
and now i equal the equation to zero and them im stuck cant solve it

2. This is because

$f'(x) = \frac{1 - \ln (2x)}{x^2}$.

Try solving it now.

3. Still not sure. Not sure how what to do with the ln(2x) and the $x^{2}$ on the bottom

4. The only way to get $\frac{1 - \ln (2x)}{x^2} = 0$ is to have $1 - \ln (2x) = 0$ or $\ln (2x) = 1$.

5. So then I would only have on critical point on that interval?