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JEE Main & Advanced JEE Main Paper (Held on 08-4-2019 Afternoon)

  • question_answer
    The number of integral values of m for which the equation \[(1+{{m}^{2}}){{x}^{2}}-2(1+3m)x+(1+8m)=0\]  has no real root is :                                                [JEE Main 8-4-2019 Afternoon]

    A) infinitely many

    B) 2

    C) 3                     

    D)   1

    Correct Answer: A

    Solution :

    D < 0 \[4{{(1+3m)}^{2}}-4(1+{{m}^{2}})(1+8m)<0\] \[\Rightarrow \]\[m{{(2m-1)}^{2}}>0\]\[\Rightarrow \]\[m>0\]     


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