Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 8 - Test - Page 474: 5

Answer

$89$

Work Step by Step

Step 1: $(8+5i)(8-5i)$ Step 2: $8(8-5i)+5i(8-5i)$ Step 3: $64-40i+40i-25i^{2}$ Step 4: $64-25i^{2}$ Step 5: $64-25(-1)$ Step 6: $64+25$ Step 7: $89$
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