Prove Theorem 5 in the case 0 2 1). THEOREM 5 Focus-Directrix Relationship Ellipse If 0
Question:
Prove Theorem 5 in the case 0 −2 − 1).
Transcribed Image Text:
THEOREM 5 Focus-Directrix Relationship
Ellipse
• If 0
THEOREM 5 Focus-Directrix Relationship
Ellipse
• If 0 b>0 and c = √a²-b², then the ellipse
()² + ()² =
satisfies Eq. (10) with F = (c,0),e=, and vertical directrix x = 2.
= 1
Hyperbola
• If e > 1, then the set of points satisfying Eq. (10) is a hyperbola, and xy-coordinate
axes can be chosen, and a, b defined, so that the hyperbola has eccentricity e and
is in standard position with equation
• Conversely, if a, b>0 and c = √a²+ b², the hyperbola
()²-()² = ¹
satisfies Eq. (10) with F = (c, 0), e=, and vertical directrix x = 4.
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