Multiple Choice Questions on A common tangent to 9x2 ndash 16y2 144 and x2 y2 9 is ........ for 11th Standard Preparation

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Multiple Choice Questions

A common tangent to 9x2 ndash 16y2 144 and x2 y2 9 is ........

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    A common tangent to 9x2 – 16y2 = 144 and x2+y2 = 9 is

    y=\frac{3}{\sqrt{7}}+\frac{15}{\sqrt{7}}

    Incorrect Answer

    y=3\sqrt\frac{2}{7}+\frac{15}{\sqrt{7}}

    Correct Answer

    y=2\sqrt\frac{3}{7}\times 15{\sqrt{7}}

    Incorrect Answer

    none of these 

    Incorrect Answer
    Explanation:

    y=3\sqrt\frac{2}{7}+\frac{15}{\sqrt{7}}

    By: Swaminath Yadav
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