Answer
$26$
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.
$=26$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
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
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