Substituting a parabola into an ellipse gives a quartic, so the discriminant trick fails. Three derivations lead to the same polynomial in b, with two real roots.
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analytic-geometrycalculusconic-sectionsellipseparabolatangency
Substituting a parabola into an ellipse gives a quartic, so the discriminant trick fails. Three derivations lead to the same polynomial in b, with two real roots.
Share this article
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