Gujarati
10-2. Parabola, Ellipse, Hyperbola
medium

दीर्घवृत्त $9{x^2} + 5{y^2} - 30y = 0$ की उत्केन्द्रता है  

A

$1\over3$

B

$2\over3$

C

$3\over4$

D

इनमें से कोई नहीं

Solution

(b) $9{x^2} + {(\sqrt 5 y – 3\sqrt 5 )^2} = 45$या $\frac{{{x^2}}}{5} + \frac{{{{(y – 3)}^2}}}{9} = 0$

 ${a^2} = 5,$ ${b^2} = 9$

इसलिए $e = \frac{2}{3}$.

Standard 11
Mathematics

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