Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 1 - Foundations for Algebra - 1-6 Multiplying and Dividing Real Numbers - Practice and Problem-Solving Exercises - Page 42: 20



Work Step by Step

We recall that 20 to the second power is 20$\times$20, which equals 400. Thus, we find: $\sqrt {400} = \sqrt {20 \times 20} =\sqrt {20^{2}}=20$
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