Can anyone give me a hint on how to do these? Just tell me which methods to use, like can problem "a" be factored or can it be found finding the common denominator?

Just hints on which methods which can be used to solve the problems.

http://img21.imageshack.us/img21/825...roblems123.jpg

I have been having a hard time just figuring out how to solve the problems so if anyone can help me, it will be appreciated it, thanks.