Geometry: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281159
ISBN 13: 978-0-13328-115-6

Entry-Level Assessment: 11

Answer

D) 441

Work Step by Step

$(-21)^2$ means $-21\times-21$, which is 441. When a negative is multiplied by a negative, the product is positive.
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