Answer
$40$
Work Step by Step
Using $(a+b)(a-b)=a^2-b^2$ and $i^2=-1$, the given expression, $
(6-2i)(6+2i)
,$ simplifies to
\begin{array}{l}\require{cancel}
(6)^2-(2i)^2
\\\\=
36-4i^2
\\\\=
36-4(-1)
\\\\=
36+4
\\\\=
40
.\end{array}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 7 - Test - Page 471: 28
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.
