When you get to later math courses, you will discover that the instructors no longer care if there are radicals in the denominator. The tutor probably just forgot that, at your stage, your instructor might "have a hissy fit" about the sqrt[9].
In all cases, however, yes, the simplification from sqrt[9] to 3 should be done. (The tutor was leaving a little bit for you to do. Good tutors don't give the whole answer!) :wink:
Eliz.