I have had several problems such as the one below, and since e is being raised to a variable, I am getting the same answer for f'(x) and f"(x)...thought I might be doing something incorrectly.

g(x) = 2 - 3e^x

g'(x) = -3e^x * (d/dx x)

g'(x) = -3e^x

g"(x) = -3e^x (d/dx x)

g"(x) = -3e^x

Please either reassure me, or show we where I am mistaken.