Find the Inverse of the Function $$f ( x ) = 7 x ^ { 2 } + 7 , x \geq 0$$

Multiple Choice

Find the inverse of the function.
- $$f ( x ) = 7 x ^ { 2 } + 7 , x \geq 0$$

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