If the Function Is One-To-One, Find Its Inverse $$f ( x ) = 5 x ^ { 2 } - 9 , x \geq 0$$

Multiple Choice

If the function is one-to-one, find its inverse. If not, write ʺnot one-to-one.ʺ
- $$f ( x ) = 5 x ^ { 2 } - 9 , x \geq 0$$

A) $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = \sqrt { \frac { 5 } { \mathrm { x } - 7 } } , \mathrm { x } \neq - 9$
B) $f ^ { - 1 } ( x ) = \sqrt { \frac { x + 9 } { 5 } } , x \geq - 9$
C) $\mathrm { f } ^ { - 1 } ( \mathrm { x } ) = \frac { 5 } { \sqrt { x } - 7 }$
D) not a one-to-one