# [✓] Determine if a function is Big-O ?

GROUPS:
 Greetings,Is anyone familiar using Wolfram Mathematica to determine whether a function is a big-O as per example below:To establish a big-O relationship, find witnesses C and k such that |f(x)| <= C|g(x)| whenever x>k. Determine whether the function is O(x^2). f(x) = 17x + 11The solution should be "Yes", because the determining factor in f(x) is less than or equal to x^2. I would like to use Mathematica to check my answer. What should my input looks like? Thanks
 Gianluca Gorni 1 Vote You can calculate the limit of the ratio, which should work in most cases: If[Abs[Limit[(17 x + 11)/x^2, x -> Infinity]] < Infinity, True, False]