I don't know how can take two different values but I have a solution :
So we need to maximize . And has its maximum when is the largest possible and is the least possible. So and :
I now think that I'm right but if not please mention it!
I got this problem from a guide book.
It is given that and .
Find the least posible value of
Answer given in the book is as follows:
Least possible value
My question is how can the variable q takes two different values in an algebraic expression.