College Algebra (10th Edition)

Published by Pearson
ISBN 10: 0321979478
ISBN 13: 978-0-32197-947-6

Chapter 2 - Section 2.2 - Graphs of Equations in Two Variables; Intercepts; Symmetry - 2.2 Assess Your Understanding - Page 164: 2



Work Step by Step

To solve the equation: $x^2-9=0$ We first add 9 to both sides: $x^2-9+9=0+9$ $x^2=9$ To solve for x, we now take the square root of both sides: $\sqrt{ x^2}=\sqrt 9$ So, $x=3,=-3$
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