Problema Solution
For the function f (x) = 7x + 9, determine whether f (x) is one-to-one. If so, find the formula for the inverse and give the domain and range for f -1.
Answer provided by our tutors
F(x) = 7x + 9 is one to one since for now two values of x we will have the same value of f(x) =>
given x1 and x2 we will never have f(x1)=f(x2)
Inverse formula => f(x) - 9 = 7x => x = (f(x) - 9)/7 => f^(-1)(y) = (y-9)/7
domain = (-infinity, infinity), range = (-infinity, infinity)