Answer
{$\pm11$}
Work Step by Step
According to the square root property,
if $x^{2}=121$
then $x=\sqrt (121)=11$ or $x=-\sqrt (121)=-11$
Therefore, the solution set is {$-11,+11$} or {$\pm11$}
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Appendix A - Equations and Inequalities - Page 417: 46
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