Let $f ( x ) = \frac { x ^ { 2 } } { 1 + x ^ { 3 } }$

Multiple Choice

Let $f ( x ) = \frac { x ^ { 2 } } { 1 + x ^ { 3 } }$ Find $X$ if $f ^ { - 1 } ( x ) = 2$

A) $1 / 2$
B) 9/4
C) 4/9
D) 2/5