1. The problem statement, all variables and given/known data Find the maximum and minimum values of f(x)=x^4e^-x over [0,10] 2. Relevant equations 3. The attempt at a solution From what I remember is you set the f' equal to 0. And that will give you two more points to test. and then you put the 0 and 10 number into the equation to find the values. When I put 0 or 10 in i get 0 for both. f'= (4x^3)(e^-x)+(x^4)(-e^-x) If i set that equal to 0; I really do not know how to find the what x is.