Answer
$-21+20i$
Work Step by Step
$(2+5i)^{2}=(2+5i)(2+5i)=2^{2}+2(2)(5i)+(5i)^{2}=4+20i+5^2*-1=4-25+20i=-21+20i$
College Algebra 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
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 - Page 131: 35
Update this answer!
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.
