Gujarati
10-2. Parabola, Ellipse, Hyperbola
easy

यदि किसी अतिपरवलय की नाभि तथा शीर्ष $(0,\; \pm 4)$ तथा $(0,\; \pm 2)$ हों, तो उसका समीकरण होगा  

A

$\frac{{{x^2}}}{4} - \frac{{{y^2}}}{{12}} = 1$

B

$\frac{{{x^2}}}{{12}} - \frac{{{y^2}}}{4} = 1$

C

$\frac{{{y^2}}}{4} - \frac{{{x^2}}}{{12}} = 1$

D

$\frac{{{y^2}}}{{12}} - \frac{{{x^2}}}{4} = 1$

Solution

(c) नाभियाँ $(0,{\rm{ }} \pm 4)$$ \equiv (0, \pm \,be)$

$⇒$ $be = 4$

शीर्ष $(0,{\rm{ }} \pm 2) \equiv (0,{\rm{ }} \pm b) $

$\Rightarrow b = 2$

$\Rightarrow a = 2\sqrt 3 $

अत: समीकरण $\frac{{ – {x^2}}}{{{{(2\sqrt 3 )}^2}}} + \frac{{{y^2}}}{{{{(2)}^2}}} = 1$ या $\frac{{{y^2}}}{4} – \frac{{{x^2}}}{{12}} = 1$.

Standard 11
Mathematics

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