Find the Interval on Which $f ( x ) = x e ^ { - x }$

Find the interval on which $f ( x ) = x e ^ { - x }$ is increasing.

A) $( - \infty , 1 ]$

B) $( - \infty , 2 ]$
C) $( - \infty , 3 ]$
D) $[ 1,2 ]$
E) $[ 1 , e ]$
F) $( - \infty , e ]$

G) $( - \infty , \infty )$

H) $\left( - \infty , \frac { 1 } { e } \right)$

Correct Answer:

Verified

Unlock this answer now
Get Access to more Verified Answers free of charge

Access For Free