Find the Slope of the Graph of the Function at the Given

Multiple Choice

Find the slope of the graph of the function at the given value. $f ( x ) = - 2 x ^ { 2 } + \frac { 6 } { x ^ { 2 } }$ when $x = 5$

A) $f ^ { t } ( 5 ) = - \frac { 2488 } { 125 }$
B) $f ^ { t } ( 5 ) = \frac { 2488 } { 125 }$
C) $f ^ { t } ( 5 ) = \frac { 2512 } { 125 }$
D) $f ^ { t } ( 5 ) = - \frac { 2512 } { 125 }$
E) $f ^ { t } ( 5 ) = - \frac { 1256 } { 125 }$