Question

Question #a5656

Answer 1

`CC - {1}`

Explanation:

You want the domain of `f^-1(x) = y`,

`x = frac{y - 5}{y + 5}`

`xy + 5x = y - 5`

`xy - y = -5x - 5`

`y = frac{-5x - 5}{x - 1} = -5 frac{x + 1}{x - 1}`

We may divide by `x - 1` if and only if `x ne 1`.