Differentiate the Given Function $$f ( x ) = e ^ { - 6 x }$$

Multiple Choice

Differentiate the given function. $$f ( x ) = e ^ { - 6 x }$$

A) $x = - 6 x e ^ { - 6 x }$
B) $x = e ^ { - 6 x }$
C) $x = - 6 e ^ { - 6 x - 1 }$
D) $x = - 6 e ^ { - 6 x }$