Answer
$\pm 11$
Work Step by Step
$\pm\sqrt{121}$ represents both the positive and the negative square roots of $121.$
.Since $11^{2}=121$, it follows that $\sqrt{121}=11$.
So,
$\pm\sqrt{121}=\pm 11$
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
Published by
Big Ideas Learning LLC
ISBN 10:
978-1-60840-838-2
ISBN 13:
978-1-60840-838-2
Chapter 6 - Exponential Functions and Sequences - Maintaining Mathematical Proficiency - Page 289: 7
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