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BCECE Engineering BCECE Engineering Solved Paper-2012

  • question_answer
    The distance between the foci of the conic \[7{{x}^{2}}-9y=63\]is equal to

    A)  8                                            

    B)         4                            

    C)         3                                            

    D)         7

    Correct Answer: A

    Solution :

    Given, equation of hyperbola is \[\frac{{{x}^{2}}}{9}-\frac{{{y}^{2}}}{7}=1\] Distance between foci \[2ae=2\sqrt{2{{a}^{2}}+{{b}^{2}}}=2\sqrt{9+7}=8\]


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