edit: I want to know the rules of this site. I no longer care about answer and that question.
First I asked this question because my attempt to solve using inequality it gives the wrong answer. So I thought it must be because it is for finding maximum value so I just ignored it. Then later I realise my method is right as it is for finding the minimum value. Then I asked this question.
But it is now closed as a duplicate. Even though they have the same equation but they have a very different objective.
My question is there a rule that that one user cannot post two questions with the same equation in them?