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10-2. Parabola, Ellipse, Hyperbola
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The eccentricity of the ellipse $9{x^2} + 5{y^2} - 30y = 0$, is
A
$1\over3$
B
$2\over3$
C
$3\over4$
D
None of these
Solution
(b) $9{x^2} + {(\sqrt 5 y – 3\sqrt 5 )^2} = 45$ or $\frac{{{x^2}}}{5} + \frac{{{{(y – 3)}^2}}}{9} = 0$
==> ${a^2} = 5,$ ${b^2} = 9$.
Therefore $e = \frac{2}{3}$.
Standard 11
Mathematics
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