Answer
$-40$
Work Step by Step
Using $i^2=-1$, the given expression, $
5i\cdot8i
,$ simplifies to
\begin{array}{l}\require{cancel}
40i^2
\\\\=
40(-1)
\\\\=
-40
.\end{array}
Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)
by Bittinger, Marvin L.; Ellenbogen, David J.; Johnson, Barbara L.
Published by
Pearson
ISBN 10:
0-32184-874-8
ISBN 13:
978-0-32184-874-1
Chapter 10 - Exponents and Radicals - 10.8 The Complex Numbers - 10.8 Exercise Set - Page 686: 35
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