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

  • question_answer
    Roots of \[a{{x}^{2}}+b=0\] are real and distinct if

    A) \[ab>0\]

    B) \[ab<0\]

    C) \[a,b>0\]

    D) \[a,b<0\]

    Correct Answer: B

    Solution :

    \[{{B}^{2}}-4AC>0\]Þ\[0-4ab>0\]Þ\[ab<0\].


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