Answer
$(21+5\sqrt 2)+(7\sqrt 5-3\sqrt {10})i$
Work Step by Step
$(3+i\sqrt5)(7-i\sqrt{10})=21-3i\sqrt {10}+7i\sqrt5+5\sqrt2$
$=(21+5\sqrt2)+(7\sqrt5-3\sqrt{10})i$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 1 - 1.5 - Complex Numbers - 1.5 Exercises - Page 119: 65
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