Question

If f(x) = 3x + 5, then what is f-1(x) ?

Answer 1

Do you mean \(f^{-1}(x)\)

Answer 2

To find inverse function, switch x and y to each other in original function then isolate y.

Answer 3

So \(f(x) = y = 3x + 5\) right? So \(f^{-1}(x) \Rightarrow x = 3y + 5\)

\(x - 5 = 3y\)
\(f^{-1} = y = \boxed{\dfrac{1}{3}x - \dfrac{5}{3}}\)

Answer 4

Is this clear? @stevensde

Answer 5

Yes, thank you very much.

Answer 6

You're welcome.

Answer 7

It's not \(that\) clear..

Answer 8

Not for you.