Question

if f(x) = 2x, then f-1(x) =

Answer 1

x/2

Answer 2

Selene did you understand?

Answer 3

A.-2x
B. 1/2x
C.x-2

Answer 4

I'll explain you
we have\[ f(x)=2x\]
we want to find \( f^{-1} (x)\)
let's replace x by \(f^{-1} (x)\)
we get
\[ f(f^{-1} (x))=2f^{-1} (x)\]
we know that \(f(f^{-1} (x))=x\)
so we get
\[ x=2f^{-1} (x)\]
or
\[f^{-1} (x)= \frac{x}{2}\]
option B