The following functions are each defined for x ∈ R.

Find f^-1(x) for each function and state its domain.

a. f(x) = e^x + 4

b. f(x) = e^x – 2

c. f(x) = 5e^x – 1

d. f(x) = 3e^2x + 1

e. f(x) = 5e^2x + 3

f. f(x) = 4e^-3x + 5

g. f(x) = 2 – e^x

h. f(x) = 5 – 2e^-2x