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10th Class Mathematics Polynomials Question Bank Case Based MCQs - Polynomials

  • question_answer
    If a and P are zeroes of \[{{x}^{2}}+3x-10\]then \[\frac{1}{\alpha }+\frac{1}{\beta }=\]

    A) 3/10

    B) 1/3

    C) 1/4

    D) 1/5

    Correct Answer: A

    Solution :

    Given, \[{{x}^{2}}+3x-10\]
                \[\alpha +\beta =-3,\,\alpha \,.\,\beta =-10\]
                \[\frac{1}{\alpha }+\frac{1}{\beta }=\frac{\alpha +\beta }{\alpha \,.\,\beta }\]
                            \[=\frac{-3}{-10}=\frac{3}{10}\]
     


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