Deriving ln[x^n]

So the mathbook says:
f(x) = ln[x^n]
f'(x) = n/x
but it doesn't give an explanation to why. Please do tell me as the website of my distance education company isn't responding at the moment.

(Had the thread open in tab, wrote reply, added it, saw that you had already answered)

Thanks anyways. The logarithm stuff was in an earlier course so I had forgotten most of it.