Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 10 - Analytic Geometry - 10.2 The Parabola - 10.2 Assess Your Understanding - Page 647: 48

Answer

Vertex: $(2,3)$ Focus: $\left(2,4\right)$ Directrix: $y=2$ See graph

Work Step by Step

We are given the parabola: $(x-2)^2=4(y-3)$ The standard equation is: $(x-h)^2=4p(y-k)$ Determine $h,k,p$: $h=2$ $k=3$ $4p=4\Rightarrow p=1$ Determine the vertex: $(h,k)=(2,3)$ Determine the focus: $(h,k+p)=\left(2,3+1\right)=\left(2,4\right)$ Determine the directrix: $y=k-p$ $y=3-1$ $y=2$ Determine the two points defining the latus rectum: $y=4$ $(x-2)^2=4(4-3)$ $(x-2)^2=4$ $x-2=\pm 2$ $x-2=-2\Rightarrow x_1=0$ $x-2=2\Rightarrow x_2=4$ $\Rightarrow (0,4),(4,4)$ Plot the points, draw the directrix, and graph the parabola:
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