To use rational roots +/- 11/5 then all the different divisions that you can form like 11/5 , -11/5, 11/-5, -11/-5 I think this is all that can be formed now if you can do each division and simplify then test in the given polynomial if you can’t simplify any terms just plug them in one by one until you get a result of zero when this happens you have found the answer any leftover terms not tested can be ignored, I hope this helps.