College Algebra (11th Edition)

Published by Pearson
ISBN 10: 0321671791
ISBN 13: 978-0-32167-179-0

Chapter 1 - Section 1.3 - Complex Numbers - 1.3 Exercises - Page 104: 82



Work Step by Step

Plug in the given values to the formula $E=IZ$. $E=(20+12i)(10-5i)$ Expand. $E=200-100i+120i-60i^2$ Note $i^2=-1$ and combine like terms. $E=(200+60)+(-100+120)i$ $E=260+20i$
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