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← JEE Main 2022 · 28 Jul · Shift 2
MathematicsSingle correct+4 / -1Question 74 of 90

JEE Main 2022 · 28 Jul · Shift 2, Mathematics question 74

Let the hyperbola H:x2a2−y2b2=1H:\dfrac{x^2}{a^2}-\dfrac{y^2}{b^2}=1 pass through the point (22,−22)\left(2\sqrt2,-2\sqrt2\right). A parabola is drawn whose focus is same as the focus of H with positive abscissa and the directrix of the parabola passes through the other focus of H. If the length of the latus rectum of the parabola is e times the length of the latus rectum of H, where e is the eccentricity of H, then which of the following points lies on the parabola ?

Choose one option
Answer and worked solution

Official answer: B

Hyperbola. The latus-rectum condition gives b2=2a2b^2=2a^2; through (22,−22)(2\sqrt2,-2\sqrt2): a2=4a^2=4, b2=8b^2=8, e=3e=\sqrt3.

Parabola with focus (23,0)(2\sqrt3,0) and directrix x=−23x=-2\sqrt3: y2=83xy^2=8\sqrt3x. (33,−62)(3\sqrt3,-6\sqrt2) fits.

(B)