1:44 Vo 4G+ LTE + you must do so using withUBBED). 8. (10 points) Let f and g be functions such that: f(x) = 2x log(x), where : R+ R . g(x)=3x3, where 9: R R (a) Determine whether f(x) is O(g(x)). Justify your answer using wit- nesses. If f(x) is not O(g(x)), then show an argument using a proof by contradiction using witnesses as to why f(x) is not O(g(x)). (b) Determine whether g(x) is O(f(x)). Justify your answer using wit- nesses. If g(x) is not O(f(x)), then show an argument using a proof by contradiction using witnesses as to why g(x) is not O(f(x)).