Question

if f(x)=9x, which of the following is the inverse of f(x)

A) f^-1(x)=9/x

B) f^-1(x)=x-9

C) f^-1(x)=x+9

D) f^-1(x)=x/9


PLEASE HURRY!!!

Answer 1

I think it's D cus the inverse of 2 is also 1 over 2

Answer 2

Answer:

$f^{-1}x=\frac{x}{9}$

Step-by-step explanation:

Given : $f(x)=9x$

To Find: Inverse of f(x)

Solution:

$y=9x$

Replace x with y and y with x.

$x=9y$

$\frac{x}{9}=y$

$\frac{x}{9}=f^{-1}x$

Thus the inverse is $f^{-1}x=\frac{x}{9}$

Hence the inverse of $f(x)=9x$ is  $f^{-1}x=\frac{x}{9}$