Intermediate Algebra: Connecting Concepts through Application

Published by Brooks Cole
ISBN 10: 0-53449-636-9
ISBN 13: 978-0-53449-636-4

Chapter 8 - Radical Functions - 8.5 Complex Numbers - 8.5 Exercises - Page 663: 45



Work Step by Step

$(2-4i)(3-5i)$ $=2(3-5i)-4i(3-5i)$ $=6-10i-12i+20i^{2}$ $=6-22i+20(-1)$ $=6-22i-20$ $=-14-22i$
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