If the Function Is One-To-One, Find Its Inverse $$f ( x ) = ( x + 6 ) ^ { 2 }$$

Multiple Choice

If the function is one-to-one, find its inverse. If not, write "not one-to-one."
- $$f ( x ) = ( x + 6 ) ^ { 2 }$$

A) $f ^ { - 1 } ( x ) = \frac { 1 } { \sqrt { x - 6 } }$
B) not a one-to-one
C) $f ^ { - 1 } ( x ) = \sqrt { x - 6 }$
D) $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = \sqrt { \mathrm { x } } - 6$