Answer
vertex: $(0,0)$
Focus: $(0,-\frac{2}{3})$
Directrix: $y=\frac{2}{3}$
Work Step by Step
$3x^2+8y=0$
or, $x^2=4(\frac{-2}{3})y$
Thus,
vertex: $(0,0)$
Focus: $(0,-\frac{2}{3})$
Directrix: $y=\frac{2}{3}$
Multivariable Calculus, 7th Edition
by Stewart, James
Published by
Brooks Cole
ISBN 10:
0-53849-787-4
ISBN 13:
978-0-53849-787-9
Chapter 10 - Parametric Equations and Polar Coordinates - 10.5 Exercises - Page 700: 4
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