# What is the big O notation of this function?

Technology CommunityCategory: Big-O NotationWhat is the big O notation of this function?
VietMX Staff asked 5 months ago
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).