**Problem**

Consider:

`f(x) = log n + 3n`

What is the big O notation of this function?

It is simply

.*O*(*n*)

When you have a composite of multiple parts in Big O notation which are added, you have to choose the biggest one. In this case it is * O(3n)*, but there is no need to include constants inside parentheses, so we are left with

*.*

`O(n)`