Hi!

I just started learning calculus this semester and it's a total brainbreak. We are on derivatives now and we just had a quiz about derivatives and limits. The problem is, when I thought I already knew derivatives I felt stupid during the whole 3 hours of answering the quiz. I found out I couldn't work on the complicated equations (especially the ones with the bar lines and radical signs) using the method our instructor taught us. I ended up having answered only one item which was a limit problem. Then a senior told me that I should have used the theorems for derivatives (not sure how to call that).

Here's one from our quiz:

Is my answer correct? Unfortunately I can no longer get any mark for getting it right so it's good as incorrect.

Thanks in advance!