#### Answer

$\sqrt d$ or $-\sqrt d$

#### Work Step by Step

When squared, both a number and its inverse give the same result, since multiplying two negative numbers yields a positive product.

Published by
Pearson

ISBN 10:
0-13417-805-X

ISBN 13:
978-0-13417-805-9

$\sqrt d$ or $-\sqrt d$

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