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: 26



Work Step by Step

$(-1-5i)(-1+5i)\qquad$ ...use the FOIL method. $=(-1)(-1)+(-1)(5i)+(-5i)(-1)+(-5i)(5i)\qquad$ ...simplify. $=1-5i+5i-25i^{2}\qquad$ ...simplify. ($i^{2}=-1$) $=1-5i+5i+25\qquad$ ...add like terms. $=26$
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