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  3. 12th Class
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12th Class Mathematics Sample Paper Mathematics Olympiad Sample Paper-4

  • question_answer
    The function f defined by \[f(x)\,\,=(x+2)\,\,{{e}^{-x}}\]is

    A)  Decreasing for all x

    B)  Decreasing on \[(-\infty ,-1)\]  and\[(-1\,,\infty )\] increasing in

    C)  Increasing for all x

    D)  Decreasing in \[(-1\,,\infty )\]  increasing in \[(-\infty ,-1)\]

    Correct Answer: D

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