Precalculus: Mathematics for Calculus, 7th Edition

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

Chapter 11 - Section 11.1 - Parabolas - 11.1 Exercises - Page 788: 11

Answer

(a) Focus: $F(0,2)$ Directrix: $y=-2~~$ Focal~diameter: $8$ (b) See graph

Work Step by Step

Equation of a parabola with vertical axis: $x^2=4py$ $x^2=8y$ $4p=8$ $p=2$ Focus: $F(0,p)=F(0,2)$ Directrix: $y=-p=-2$ Focal~diameter$=4p=8$
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