Question

What is the inverse of the function below?

f(x) = -2
=
A. f-'(x) = 5(x - 2)
B. f-'(x) = 2(x - 5)
c. f-1(x) = 2(x + 5)
D. f-1(x) = 5(x + 2)
=

Answer 1

What function, when you plug in
`(x/5 - 2)`, will give you
`x` back?

Well first you'd want to add 2 to get
`x/5`, and then multiply by 5 to get just
`x`. So the function given by "add two then multiply by five" is
`(x + 2) \cdot 5`, which is option D.