Multiple Choice Questions on If the roots of the equation px2 x r 0 are reciprocal to each other then which one of the following ........... for CDS Exam Preparation

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Multiple Choice Questions

If the roots of the equation px2 x r 0 are reciprocal to each other then which one of the following ...........

Quantitative Aptitude (CDS) Quadratic Equations
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    If the roots of the equation px2 + x + r = 0 are reciprocal to each other, then which one of the following is correct?

    p = 2r

    Incorrect Answer

    p = r

    Correct Answer

     2p = r

    Incorrect Answer

    p = 4r

    Incorrect Answer
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    Explanation:

    Let the roots be x and 1/x.
    Use the property of quadratic equations
    {x+y = -b/a , xy = c/a};
    x*1/x = r/p
    1 = r/p; r = p

    By: Munesh Kumari
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