Answer
51
Work Step by Step
Given: $(5+i)(10-i) $
$=50-5i+10i-i^2$
$=50+5i+1$
$=51+5i$
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 - Standardized Test Practice - Gridded Answer - Page 327: 10
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