Answer
$146$
Work Step by Step
$\left( 5-11i\right) \left( 5+11i\right) =5^{2}-\left( 11i\right) ^{2}=25-121i^{2}=25-121\times \left( -1\right) =25+121=146$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 1 - Equations and Inequalities - Chapter 1 Test Prep - Review Exercises - Page 178: 25
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