Here's the question you clicked on:
Babyslapmafro
True or false? L'Hopital's rule does not apply to the following function (click to see).
\[\lim_{x \rightarrow -\infty}\frac{ lnx}{ x} \]
lnx is undefined if x<0 right, so my guess is that the statement is true...
I think you're correct. Since the natural log is undefined for negative numbers, the limit as x goes to -infinity of ln(x) is undefined, so you can't use L'hopitals.