RAJASTHAN ­ PET Rajasthan PET Solved Paper-2008

  • question_answer
    The equation of tangent to the hyperbola \[2{{x}^{2}}-3{{y}^{2}}=6\]which is parallel to the line \[y-3x-4=0,\]is

    A)  \[y=3x+8\]       

    B)  \[y=3x-8\]

    C)  \[y=3x+2\]       

    D)  None of these

    Correct Answer: D

    Solution :

     Let equation of the line which is parallel to \[y-3x-4=0\]is \[y=3x+k\] \[\because \] It is a tangent to the hyperbola \[\frac{{{x}^{2}}}{3}-\frac{{{y}^{2}}}{2}=1\] \[\therefore \] \[k=\sqrt{3{{(3)}^{2}}-2}\] \[(\because k=\sqrt{{{a}^{2}}{{m}^{2}}-{{b}^{2}}})\] \[=\sqrt{25}=5\] Hence, required equation of tangent is \[y=3x+5\]


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