Find the Inverse of the Function $$f ( x ) = \frac { 4 } { x + 7 }$$

Multiple Choice

Find the inverse of the function.
- $$f ( x ) = \frac { 4 } { x + 7 }$$

A) $f ^ { - 1 } ( x ) = \frac { x } { 7 + 4 x }$
B) $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = \frac { 7 + 4 \mathrm { x } } { \mathrm { x } }$
C) Not a one-to-one function
D) $f ^ { - 1 } ( x ) = \frac { - 7 x + 4 } { x }$