Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 4 Quadratic Functions and Factoring - 4.6 Perform Operations with Complex Numbers - 4.6 Exercises - Skill Practice - Page 280: 54



Work Step by Step

$(1-9i)(1-4i)(4-3i)\qquad$ ...apply the FOIL method to multiply $(1-9i)(1-4i)$ $=(1-4i-9i+36i^{2})(4-3i)\qquad$ ...simplify ($i^{2}=-1$). $=(-35-13i)(4-3i)\qquad$ ...apply the FOIL method. $=-140+105i-52i+39i^{2}\qquad$ ...simplify ($i^{2}=-1$). $=-179+53i$
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