JEE Main & Advanced Mathematics Complex Numbers and Quadratic Equations Question Bank Solution of quadratic equations and Nature of roots

  • question_answer
    If the roots of \[4{{x}^{2}}+px+9=0\] are equal, then absolute value of p is [MP PET 1995]

    A) 144

    B) 12

    C) \[-12\]

    D) \[\pm 12\]

    Correct Answer: D

    Solution :

    Accordingly, \[{{p}^{2}}=144\,\,\Rightarrow \,\,p=\pm 12\].


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