Find the Inverse of the Function $$g ( x ) = x ^ { 2 } - 9 , x \geq 0$$

Multiple Choice

Find the inverse of the function. $$g ( x ) = x ^ { 2 } - 9 , x \geq 0$$

A) $g ^ { - 1 } ( x ) = - \sqrt { x + 9 }$
B) $g ^ { - 1 } ( x ) = \sqrt { x + 9 }$
C) $g ^ { - 1 } ( x ) = 9 + \sqrt { x }$
D) $g ^ { - 1 } ( x ) = 9 - \sqrt { x }$
E) none of these