Answer
$\sqrt 2-x$
Work Step by Step
We are told on page 442 that the conjugate of the term $(a+b)$ is the term$(a-b)$.
Therefore, if $a=\sqrt 2$ and $b=x$, then the conjugate of the given expression is $a-b=\sqrt 2-x$.
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 7 - Section 7.5 - Rationalizing Denominators and Numerators of Radical Expressions - Exercise Set - Page 445: 35
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