differentiation

Question: The function f defined by $f(x)=(x+2){{e}^{-x}}$ is



1) Decreasing for all x
2) Decreasing in $(-\infty ,\,-1)$ and increasing in $(-1,\infty )$
3) Increasing for all x
4) Decreasing in $(-1,\,\infty )$ and increasing in $(-\infty ,\,-1)$
Solution: Explanation: No Explanation
Increasing and Decreasing function

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