1. The problem statement, all variables and given/known data Hi I'm suppose to find the critical point and minimun or maximum of f(x)=(4/5) 2. Relevant equations I have a question regarding how to interprete the results 3. The attempt at a solution 1) we start by finding f'(x)=4/(5*x^1/5) Now my first question is this: we cannot divide by 0, so i it correct to assume that f'(x) must be undefined at x=0? Usually we set f'(x)= 0 to find the x value, and that value is the critical point. 4/(5*x^1/5) = 0 but the only result i can get is 4=0 if i solve this equation which is surely not true. What is the correct way to interprete or argue about this result?