Originally Posted by

**topher0805** Differentiate.

$\displaystyle f(x) = \frac {7 - xe^x}{x + e^x} $

Sorry I am asking so many questions tonight, but I've been really sick for the past 10 days and have not been able to attend any classes. I'm trying to catch up, but some of these questions seem impossible.

I thought I knew how to do this one. I used the quotient rule, $\displaystyle f'(\frac {u}{v}) = \frac {vu' - uv'}{v^2}$ but I end up getting the wrong answer.

These are my steps:

$\displaystyle \frac {(x+e^x)(7-xe^x)' - (7-xe^x)(x+e^x)'}{(x+e^x)^2}$