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: 13

Answer

(a) Focus: $F(-6,0)$ Directrix: $x=6$ $Focal~diameter=24$ (b)

Work Step by Step

Equation of a parabola with horizontal axis: $y^2=4px$ $y^2=-24x$ $4p=-24$ $p=-6$ Focus: $F(p,0)=F(-6,0)$ Directrix: $x=-p=6$ $Focal~diameter=|4p|=24$
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