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QJEEM24Ma2fcc: JEE Main 2024 Mathematics - Class 11 JEEM24Ma2fcc Solution: Let the foci and length of the latus rectum of an ellipse and , …

Let the foci and length of the latus rectum of an ellipse \frac{x^2}{a^2}+\frac{y^2}{b^2}=1, a>b b e( \pm 5,0) and 50\sqrt{50} , respectively. Then, the square of the eccentricity of the hyperbola x2b2−y2a2b2=1\frac{x^2}{b^2}-\frac{y^2}{a^2 b^2}=1 equals

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amp; focii ≡(±5,0);2b2a=50amp;a=5b2=52a2amp;b2=a2(1−e2)=52a2\begin{aligned}& \text { focii } \equiv( \pm 5,0) ; \frac{2 b^2}{a}=\sqrt{50} \\& a=5 \quad b^2=\frac{5 \sqrt{2} a}{2} \\& b^2=a^2\left(1-e^2\right)=\frac{5 \sqrt{2} a}{2}\end{aligned}

amp;⇒a(1−e2)=522amp;⇒5e(1−e2)=522amp;⇒2−2e2=eamp;⇒2e2+e−2=0amp;⇒2e2+2e−e−2=0amp;⇒2e(e+2)−1(1+2)=0amp;⇒(e+2)(2e−1)=0amp;∴e≠−2;e=12\begin{aligned}& \Rightarrow \mathrm{a}\left(1-\mathrm{e}^2\right)=\frac{5 \sqrt{2}}{2} \\& \Rightarrow \frac{5}{\mathrm{e}}\left(1-\mathrm{e}^2\right)=\frac{5 \sqrt{2}}{2} \\& \Rightarrow \sqrt{2}-\sqrt{2} \mathrm{e}^2=\mathrm{e} \\& \Rightarrow \sqrt{2} \mathrm{e}^2+\mathrm{e}-\sqrt{2}=0 \\& \Rightarrow \sqrt{2} \mathrm{e}^2+2 \mathrm{e}-\mathrm{e}-\sqrt{2}=0 \\& \Rightarrow \sqrt{2} \mathrm{e}(\mathrm{e}+\sqrt{2})-1(1+\sqrt{2})=0 \\& \Rightarrow(\mathrm{e}+\sqrt{2})(\sqrt{2} \mathrm{e}-1)=0 \\& \therefore \mathrm{e} \neq-\sqrt{2} ; \mathrm{e}=\frac{1}{\sqrt{2}}\end{aligned}

amp;x2 b2−y2a2 b2=1a=52amp;b=5amp;a2b2=b2(e12−1)⇒e12=51amp;\begin{aligned}& \frac{\mathrm{x}^2}{\mathrm{~b}^2}-\frac{\mathrm{y}^2}{\mathrm{a}^2 \mathrm{~b}^2}=1 \quad \mathrm{a}=5 \sqrt{2} \\& b=5 \\& a^2 b^2=b^2\left(e_1^2-1\right) \Rightarrow e_1^2=51 \\&\end{aligned}

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