Answer
$ -5 +12i$
Work Step by Step
$(2+3i)^2$
$= 4 + 6i + 6i+ 9i^2$
$= 4+12i+ 9\times (-1)$
$= 4 - 9 + 12i$
$= -5 +12i$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 2 - Section 2.1 - Complex Numbers - Exercise Set - Page 314: 19
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