Answer
$$ (3,9); (-3,9)$$
Work Step by Step
We find the x points:
$$ 18-x^2=x^2 \\ 18-x^2=x^2 \\ x^2=9 \\ x=\pm 3$$
The corresponding y values are:
$$ y =(3)^2 =(-3)^2 =9$$
Thus, the points are:
$$ (3,9); (-3,9)$$
Elementary Geometry for College Students (7th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Cengage
ISBN 10:
978-1-337-61408-5
ISBN 13:
978-1-33761-408-5
Chapter 10 - Section 10.1 - The Rectangular Coordinate System - Exercises - Page 451: 50
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