Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 4 - 4.4 - Translations of Conics - 4.4 Exercises - Page 347: 27


Vertex: $(1,-2)$ Focus: $(h,k+p)=(1,-4)$ Directrix: $y=0$

Work Step by Step

Standard form of a parabola with vertical axis, vertex $(h,k)$ and focus $(h,k+p)$ $(x-h)^2=4p(y-k)$ $(x-1)^2+8(y+2)=0$ $(x-1)^2=-8(y+2)$ $h=1$ and $k=-2$ Vertex: $(1,-2)$ $4p=-8$ $p=-2$ Focus: $(h,k+p)=(1,-2+(-2))=(1,-4)$ Directrix: $y=k-p=-2-(-2)=0$
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