Use a Sign Chart to Determine the Intervals on Which $f ( x ) = e ^ { 2 x } \left( 1 - e ^ { x } \right)$

Essay

Use a sign chart to determine the intervals on which $f ( x ) = e ^ { 2 x } \left( 1 - e ^ { x } \right)$ is concave up and concave down, and identify the locations of any inflection points.