Calculate the Derivative of the Function $$f ( x ) = \frac { 8 } { x } ; f ^ { \prime } ( - 1 )$$

Multiple Choice

Calculate the derivative of the function. Then find the value of the derivative as specified.
- $$f ( x ) = \frac { 8 } { x } ; f ^ { \prime } ( - 1 )$$

A) $\mathrm { f } ^ { \prime } ( \mathrm { x } ) = 8 ; \mathrm { f } ^ { \prime } ( - 1 ) = 8$
B) $f ^ { \prime } ( x ) = - 8 x ^ { 2 } ; f ^ { \prime } ( - 1 ) = - 8$
C) $f ^ { \prime } ( x ) = \frac { 8 } { x ^ { 2 } } ; f ^ { \prime } ( - 1 ) = 8$
D) $f ^ { \prime } ( x ) = - \frac { 8 } { x ^ { 2 } } ; f ^ { \prime } ( - 1 ) = - 8$