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8th Class Mathematics Algebraic Expressions Question Bank Algebra

  • question_answer
    The sum of the reciprocals of \[P(x)={{x}^{3}}-3{{x}^{2}}+4x-12\] and \[P(3)=0\]is

    A)  \[P(3)=0\]                  

    B)  \[P(3)={{3}^{3}}-{{3}^{2}}+4\times 3-12\]

    C) 1                                 

    D) 0

    Correct Answer: B

    Solution :

    The reciprocal of \[(\frac{1}{2},1)\] The reciprocal of \[(2,\frac{1}{2})\] Adding these two reciprocals, we have \[5{{x}^{2}}-7x-6=0\] \[\left( -\frac{3}{5},2 \right)\]


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