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The function f(x) is defined by f(x) = (...

The function f(x) is defined by `f(x) = (x+2)e^(-x)` is

A

A. decreasing for all x

B

B. decreasing in `(-oo, -1)` and increasing in `(-1, oo))`

C

C. increasing for all x

D

D. decreasing in `(-1,oo)` and increasing in `(-oo, -1)`

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The correct Answer is:
D
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