CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2009

  • question_answer
    The equation of the parabola whose focus (3, 2) and vertex (1, 2), is

    A)  \[{{x}^{2}}+4x-8y+12=0\]

    B)  \[{{x}^{2}}-4x-8y+12=0\]

    C)  \[{{y}^{2}}-8x-4y+12=0\]

    D)  \[{{y}^{2}}+4y-8x+12=0\]

    E)  \[{{y}^{2}}-8x-2y-17=0\]

    Correct Answer: C

    Solution :

    Given, F(3, 2) and V(1, 2). Here, we see that y-coordinates are same, it means that axis of the parabola is parallel to \[x-\]axis. Here,        \[a=3-1=2\] \[\therefore \]Required equation of parabola is                 \[{{(y-2)}^{2}}=4\times 2(x-1)\] \[\Rightarrow \]               \[{{y}^{2}}-4y-8x+12=0\]


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