Question

What is the inverse function of f(x)=2x+9

Answer 1

You need to solve y=2x+9 for x as a first step.

Answer 2

\(f(x) = 2x + 9 \rightarrow f^{-1}(x) = \dfrac{x-9}{2}\)

Answer 3

@One098

Answer 4

Okay, thanks

Answer 5

f(x) = 2x + 9
let y = 2x + 9

Answer 6

interchange x and y
x = 2y + 9

Answer 7

Ok thanks!

Answer 8

now make y the subject of the formula

Answer 9

x = 2y + 9
x - 9 = 2y
(x - 9)/2 = y

Answer 10

f‾¹(x) = (x - 9)/2 and u get this :)