Answer
-11
Work Step by Step
$\sqrt 121=11$, because $11^{2}=11\times11=121$
Therefore, $-\sqrt 121=-11$. In this case, we are just taking the opposite of $\sqrt 121$, which is $-(11)=-11$
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 7 - Section 7.1 - Radicals and Radical Functions - Exercise Set - Page 417: 55
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