Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 10 - Review: 97

Answer

$-8\sqrt 5$

Work Step by Step

$(\sqrt 5-5)(2\sqrt 5+2)$ =$\sqrt 5(2\sqrt 5+2)-5(2\sqrt 5+2)$ =$2\sqrt 5\sqrt 5+2\sqrt 5-10\sqrt 5-10$ =$2(5)+2\sqrt 5-10\sqrt 5-10$ =$10+2\sqrt 5-10\sqrt 5-10$ =$10-10+(2-10)\sqrt 5$ =$-8\sqrt 5$
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