Trigonometry 7th Edition

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

Chapter 8 - Section 8.1 - Complex Numbers - 8.1 Problem Set - Page 426: 69

Answer

$\frac{-5}{13}+\frac{12}{13}i$

Work Step by Step

Step 1: $\frac{2+3i}{2-3i}\times\frac{2+3i}{2+3i}$ Step 2: $\frac{(2+3i)(2+3i)}{(2+3i)(2-3i)}$ Step 3: $\frac{2(2+3i)+3i(2+3i)}{2^{2}-(3i)^{2}}$ Step 4: $\frac{4+6i+6i+9i^{2}}{4-9i^{2}}$ Step 5: $\frac{4+12i+9(-1)}{4-9(-1)}$ Step 6: $\frac{4-9+12i}{13}$ Step 7: $\frac{-5+12i}{13}$ Step 8: $-\frac{5}{13}+\frac{12}{13}i$
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