1. The problem statement, all variables and given/known data Integrate the following via substituion: t = r(r2 -4)5[/sub] 3. The attempt at a solution I tried numerous variations. I tried substituting in u = r^(2/5) -4r^(1/5) also u=r^2 -4 and u = r^(11/5) -4r^(1/5) NONE of these substitutions worked because of the lone r which happens to the co-effiecient of (r2 -4)5[/sub]. NO LUCK. Can you PLEASE HELP. Thank you in advance.