Determine the Values of X for Which F(x) and G(x) $$f ( x ) = x ^ { 2 } - 13 , g ( x ) = - \sqrt { x + 13 }$$

Multiple Choice

Determine the values of x for which f(x) and g(x) are inverse functions.
- $$f ( x ) = x ^ { 2 } - 13 , g ( x ) = - \sqrt { x + 13 }$$

A) $x \geq 13$
B) $x \leq 13$
C) $x \leq 0$
D) $x \geq 0$