Using the Derivative of F(x) Given Below, Determine the Critical $$f ^ { \prime } ( x ) = ( x - 5 ) e ^ { - x }$$

Multiple Choice

Using the derivative of f(x) given below, determine the critical points of f(x) .
- $$f ^ { \prime } ( x ) = ( x - 5 ) e ^ { - x }$$

A) -6
B) -5
C) 5
D) 6