The function f is given, for $x > 0$, by $$\mathrm { f } ( x ) = \frac { x ^ { 3 } - 4 x } { 2 \sqrt { x } }$$ Find the value of $f ^ { \prime } ( 4 )$.
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The function f is given, for $x > 0$, by
$$\mathrm { f } ( x ) = \frac { x ^ { 3 } - 4 x } { 2 \sqrt { x } }$$
Find the value of $f ^ { \prime } ( 4 )$.