The Function F(x) = X² - 2 Is One-To-One on the Domain

Multiple Choice

The function f(x) = x² - 2 is one-to-one on the domain (x $\le$ 0) .Find f ^-1(x) .

A) $f ^ { - 1 } ( x ) = - \sqrt { x + 2 }$
B) $f ^ { - 1 } ( x ) = \frac { 1 } { x ^ { 2 } - 2 }$
C) $f ^ { - 1 } ( x ) = \sqrt { x + 2 }$
D) $f ^ { - 1 } ( x ) = \sqrt { x - 2 }$
E) f ^-1(x) = x² + 2