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Help needed

Kindly help in the following question. give rough idea.

Note by Mahimn Bhatt
2 years, 5 months ago

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Substitute \(x^2=9a^2-y^2\) in the equation of ellipse and make \(D>0\) Pranjal Jain · 2 years, 5 months ago

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@Pranjal Jain It does not contain any term in \(\large{y}\) , just \(\large{y^{2}} \) and some terms in \(\large{c}\) and \(\large{a}\) Mahimn Bhatt · 2 years, 5 months ago

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@Mahimn Bhatt \(\dfrac{9a^2-y^2}{4c^2}+\dfrac{y^2}{c^2}=1\\\Rightarrow 9a^2-y^2+4y^2=4c^2\\\Rightarrow 3y^2=4c^2-9a^2>0\\\Rightarrow 4c^2>9a^2\) Pranjal Jain · 2 years, 5 months ago

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@Pranjal Jain Using this inequality, check out which option satisfies. Pranjal Jain · 2 years, 5 months ago

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@Pranjal Jain yes i m stuck now... Mahimn Bhatt · 2 years, 5 months ago

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