College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter 1, Equations and Graphs - Section 1.5 - Complex Numbers - 1.5 Exercises: 35

Answer

$-21+20i$

Work Step by Step

$(2+5i)^{2}=(2+5i)(2+5i)=2^{2}+2(2)(5i)+(5i)^{2}=4+20i+5^2*-1=4-25+20i=-21+20i$
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