Find the inverse of the function f(x) = 2/3x + 5. Mention if there is any restriction on domain of f^ -1

Answer 1

y = 2/3 x + 5
y-5 = 2/3 x
x = 3/2 (y-5)

so, f^-1(x) = 3/2 (x-5)

as with all polynomials, the domain is all real numbers.