How do you find the domain and range of exponential functions #f(x) = 2 - e ^ (x / 2)#?
The domain of a exponential function is Usually
Unless, the domain is restricted this usually specified by the use of function notation in the question.
The range of the most basic exponential
Or a combination of these transformations.
For Working out range I think it is best you sketch the curve yourself or use a graphing app e.g Desmos or A Graphing calculator Like the CAS T-nspire.