Differentiate $f ( x ) = \frac { x ^ { 2 } } { x - 2 }$

Multiple Choice

Differentiate: $f ( x ) = \frac { x ^ { 2 } } { x - 2 }$

A) $\frac { x ^ { 2 } - 4 x } { ( x - 2 ) ^ { 2 } }$
B) $\frac { x ^ { 2 } + 4 x } { ( x - 2 ) ^ { 2 } }$
C) 2x
D) -x