Okay, three students have already approached me about the latest
WebAssign and have pointed out that they are having trouble with a
problem that I said was done in class. Actually, it is not the exact
problem, but a very similar one. I know it's tough, so I've decided to
post the partial solution here. I have not included all the details,
but I think enough for everyone to try it again on their own.
Here's the video link:
http://screencast.com/t/Z16MkZZF9xc
If you're having trouble, please do your best to make sense out of
this problem.