Answer
$-20$
Work Step by Step
$(\sqrt 5+5)(\sqrt 5-5)$
=$\sqrt 5(\sqrt 5-5)+5(\sqrt 5-5)$
=$\sqrt 5\sqrt 5-5\sqrt 5+5\sqrt 5-25$
=$(\sqrt 5)^{2}-5\sqrt 5+5\sqrt 5-25$
=$(\sqrt 5)^{2}-25$
=$5-25$
=$-20$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 10 - Test - Page 750: 19
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