Algebra: A Combined Approach (4th Edition)

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

Chapter 10 - Section 10.7 - Complex Numbers - Exercise Set: 44

Answer

$30$

Work Step by Step

$(\sqrt{5} - 5i)(\sqrt{5} + 5i) = 5 + 5i \sqrt{5} - 5i \sqrt{5} - (5i)^2 = 5 - 25(-1) = 30$
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