Question

Determine the extreme values of f(x) = e^x / (1+e^x) , 0 13 years ago

Answer 1

The derivative i got is e^x / (1+e^x)

but what's the critical number in here

Answer 2

In your derivative, the denominator should be squared. Either way, it still does not equal 0 on the interval, so your extreme values are at the endpoints of the interval.