Lines Meeting at a Vertex

Problem

Let AA and BB be the left and right vertices of the ellipse C ⁣:x2a2+y2b2=1C \colon \dfrac{x^2}{a^2} + \dfrac{y^2}{b^2} = 1 (with a>b>0a > b > 0). The minor axis of CC has the same length as its focal distance, and CC passes through the point (2,1)(-\sqrt{2}, 1).

1. Find the standard equation of CC. 2. A line through the right focus FF meets CC at two points M,NM, N (distinct from A,BA, B). Lines AMAM and ANAN, extended, meet the line l ⁣:x=22l \colon x = 2\sqrt{2} at two distinct points P,QP, Q. Prove that lines MQMQ and NPNP intersect at the point BB.

Answer

Solution

Difficulty7/10
Topicsconic sections, analytic geometry, Vieta's Formulas, Symmetry

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