Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 11 - Review - Exercises - Page 834: 43

Answer

parabola. vertex $V(0, 1)$, focus $F(0,-2)$, directrix $y=4$ See graph.

Work Step by Step

Step 1. Identify the type of the conics: rewrite the equation as $x^2=-12(y-1)$ the equation is of the form of a parabola. Step 2. The vertex can be found at $V(0, 1)$ Step 3. With $4p=12$, we get $p=3$, so the focus is at $(0, 1-p)$ or $F(0,-2)$ Step 4. The directrix can be found as $y=1+p=4$ Step 5. See graph.
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