Precalculus (10th Edition)

Published by Pearson
ISBN 10: 0-32197-907-9
ISBN 13: 978-0-32197-907-0

Chapter 9 - Polar Coordinates; Vectors - 9.3 The Complex Plane; De Moivre's Theorem - 9.3 Assess Your Understanding - Page 594: 25



Work Step by Step

By computing using the given values: $2\cdot (\cos {(120^\circ)}+i\cdot \sin{(120^\circ))} \\=2\left(-\frac{1}{2}+i\frac{\sqrt3}{2}\right) \\=-1+\sqrt3i$
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