#### Answer

$(x-1)(x+1)$

#### Work Step by Step

RECALL:
A difference of two squares can be factored using the formula:
$a^2-b^2=(a-b)(a+b)$
Using the formula above, we obtain:
$x^2-1
\\= x^2-1^2
\\ = (x-1)(x+1)$

Published by
Cengage Learning

ISBN 10:
1285194055

ISBN 13:
978-1-28519-405-9

$(x-1)(x+1)$

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