Use Google (or your favorite search engine) and type in 'what is symbloses' and check what Wikipedia has to say and then go back and do the same thing with mutualism and I think you will come to an understanding of the difference between then.
Go to wikipedia.org and do a search for mutualism and symbiosis (if this is for a school project, this should only be a starting point and you'll need to use the references for your research)
Basically mutualism is a subtype of symbiosis, where the interaction is one that is beneficial to both parties.
You can also get help by going to a tutoring site such as www.tutor.com (they've got 10 minutes free, so you can get this question answered)
Login using the form on the top of the page to post feedback (if you are a registered user). If you have not yet registered, click here to do so. It's FREE!.