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  3. 12th Class
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12th Class Mathematics Sample Paper Maths Olympiad Model Paper-2

  • question_answer
    For which interval the given function \[f(x)=-2{{x}^{3}}-9{{x}^{2}}-12x+1\] is decreasing

    A)  \[(-2,\,\,\infty )\]            

    B)  \[(-2,\,\,-1)\]

    C)  \[(-\infty ,\,\,-1)\]                       

    D)  \[(-\infty ,-2)\,\,\And \,\,(-1,\infty )\]

    E)  None of these

    Correct Answer: D

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