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JEE Main & Advanced Mathematics Differential Equations Question Bank Order and degree of differential equations

  • question_answer
    The order of differential equations of all parabolas having directrix parallel to x-axis is    [Orissa JEE 2004]

    A)                 3             

    B)                 1

    C)                 4             

    D)                 2

    Correct Answer: A

    Solution :

                       The equation of all parabolas having directrices parallel to x-axis is \[{{(x-h)}^{2}}=\pm 4a(y-k)\].            There are three arbitrary constants, h, k and a.                 \[\therefore \] order = 3.


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