What are the anwser and how do I solve these

4. Let f(x) = - *. Show that S f(x) dx is divergent. Be clear with your process. Vx 2 + 1 5. Let f(x) = . Without directly evaluating the integral, show that J f(x) dx converges. xte Be clear with your process. (HINT: find a function that is greater in value than f(x) for all x E [0, co) and show its integral converges)