#### Answer

$x^2-9$

#### Work Step by Step

Remember that the product of the sum and difference of the same two terms is the difference of their squares.
$(x-3)(x+3)=x^2-9$

Published by
Prentice Hall

ISBN 10:
0133500403

ISBN 13:
978-0-13350-040-0

$x^2-9$

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