Given F (X), Write an Equation For $f ^ { - 1 } ( x )$

Multiple Choice

Given f (x) , write an equation for $f ^ { - 1 } ( x )$ ) and then graph f (x) and $f ^ { - 1 } ( x )$ ) on the same coordinate system.
- $$f ( x ) = x ^ { 2 } - 9 ; x \leq 0$$

A) $f ^ { - 1 } ( x ) = \sqrt { x + 9 }$


B) $f ^ { - 1 } ( x ) = - \sqrt { x + 9 }$

C) $f ^ { - 1 } ( x ) = \sqrt { x + 9 }$


D) $f ^ { - 1 } ( x ) = - \sqrt { x + 9 }$