Manipal Engineering Manipal Engineering Solved Paper-2009

  • question_answer
    \[\left\{ x\in R:\frac{2x-1}{{{x}^{3}}+4{{x}^{2}}+3x}\in R \right\}\]equals

    A) \[R-\{0\}\]

    B) \[R-\{0,\,\,1,\,\,3\}\]

    C) \[R-\{0,\,\,-1,\,\,-3\}\]

    D) \[R-\left\{ 0,\,\,-1,\,\,-3,\,\,+\frac{1}{2} \right\}\]

    Correct Answer: C

    Solution :

    Let\[A=\left\{ x\in R:\frac{2x-1}{{{x}^{3}}+4{{x}^{2}}+3x} \right\}\] Now,\[{{x}^{3}}+4{{x}^{2}}+3x=x({{x}^{2}}+4x+3)\]                                 \[=x(x+3)(x+1)\] \[\therefore \]  \[A=R-\{0,\,\,-1,\,\,-3\}\]


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