#### Answer

{ x | x $\ne$ ± 3}

#### Work Step by Step

Since division by 0 is not allowed, we must have:
x² - 9 $\ne$ 0
x² $\ne$ 9
x $\ne$ ± $\sqrt 9$
x $\ne$ ± 3

Published by
Cengage

ISBN 10:
1285740629

ISBN 13:
978-1-28574-062-1

{ x | x $\ne$ ± 3}

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