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10-2. Parabola, Ellipse, Hyperbola
easy

જો અતિવલયનો નાભિલંબ 8 અને ઉત્કેન્દ્રતા $\frac{3}{{\sqrt 5 }}$હોય, તો અતિવલયનું સમીકરણ.....

A

$4x^2 - 5y^2 = 100$

B

$5x^2 - 4y^2 = 100$

C

$4x^2 + 5y^2 = 100$

D

$5x^2 + 4y^2 = 100$

Solution

$\,\frac{{{\rm{2}}{{\rm{b}}^{\rm{2}}}}}{a}\,\, = \,\,8$ અને  $\frac{3}{{\sqrt 5 }}\,\, = \,\,\sqrt {1\, + \,\,\frac{{{b^2}}}{{{a^2}}}} $

અથવા  $\frac{4}{5}\,\,\, = \,\,\frac{{{b^2}}}{{{a^2}}}$

$ \Rightarrow \,\,a\,\, = \,\,5,\,\,b\,\, = \,\,2\,\,\sqrt 5 $

આથી માંગેલ અતિવલય નું સમીકરણ 

$\frac{{{x^2}}}{{25}}\, – \,\,\frac{{{y^2}}}{{20}}\,\, = \,\,1\,\, \Rightarrow \,\,4{x^2}\,\, – \,\,5{y^2}\,\, = \,\,100$

 

Standard 11
Mathematics

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