Precalculus (10th Edition)

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

Chapter 1 - Graphs - 1.2 Graphs of Equations in Two Variables; Intercepts; Symmetry - 1.2 Assess Your Understanding: 2

Answer

$x_{1}$=3 $x_{2}$=-3

Work Step by Step

$x^{2}$-9=0 Add 9 to both sides $x^{2}$-9+9=0+9 Simplify $x^{2}$=9 Take the square root of both sides $\sqrt x^{2}$=$\pm\sqrt 9$ $x_{1}$=3 $x_{2}$=-3
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