Question

let f(x)= (x-5)/2. Find f^-1

Answer 1

\( \color{Black}{\Rightarrow y = \Large{x - 5 \over 2} }\)

\( \color{Black}{\Rightarrow 2y = x - 5 }\)

\( \color{Black}{\Rightarrow 2y + 5 = x }\)

Just replace y with x, and x with f^-1(x)

\( \color{Black}{\Rightarrow f^{-1}(x) = 2x + 5 }\)

Answer 2

is that what the answer is?