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10-2. Parabola, Ellipse, Hyperbola
easy
ઉપવલય $9x^2 + 5y^2 - 30y = 0 $ ની ઉત્કેન્દ્રતા ....
A
$1/3$
B
$2/3$
C
$3/4$
D
એકપણ નહિ
Solution
$\,{\rm{9}}{{\rm{x}}^{\rm{2}}}\,\, + \,\,{\left( {\sqrt 5 \,y\,\, – \,\,3\sqrt 5 } \right)^2}\,\, = \,\,45$
$\frac{{{x^2}}}{5}\,\, + \;\,\frac{{{{\left( {y\,\, – \,\,3} \right)}^2}}}{9}\,\, = \,\,1$
$ \Rightarrow \,\,{a^2}\,\, = \,\,5,\,\,{b^2}\,\, = \,\,9\,\,$
તેથી $\,e\,\, = \,\,\frac{2}{3}$
Standard 11
Mathematics