A)Find the critical points off on the given interval.
B)Determine the absolute extreme values of f on the given interval.
F(x)=xe^-x/2 on (0,5)
f = x e^(-x/2)
f' = (2-x) e^(-x/2)
critical points where f'=0, so that's at x=2.
f(2) = 2/e
check the endpoints of the interval for absolute min.