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RAJASTHAN ­ PET Rajasthan PET Solved Paper-2003

  • question_answer
    The equation of directrix of the parabola \[{{y}^{2}}=-12x\]is

    A)  \[x+3=0\]           

    B)  \[x=3\]

    C)  \[y+3=0\]           

    D)  \[y-3=0\]

    Correct Answer: B

    Solution :

     Comparing the parabola\[{{y}^{2}}=-12x\]with \[{{y}^{2}}=-4ax,\]we get\[a=3,\] \[\therefore \]Equation of directrix is\[x=3\]


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