Easy domain and range question?

Question

I just took a surprisingly easy multi test (my school isn't very smart) and I feel unsure about this question (ironically the most straightforward one).

Find the domain and range of e^(x-y).

I am 90% sure I got this right but I am retarded about e so can someone please assure me? Thanks in advance

Answer 1

e^(x-y) is defined for every exponent. So x and y can be any real number. The domain is all reals. There is no way to get a negative number or zero from the expression so the range is (0 , ∞).