Answer
$34$
Work Step by Step
RECALL:
(1) $(a+b)(a-b) = a^2-b^2$
(2) $i^2=-1$
Use rule (1) above to obtain:
$=3^2 - (5i)^2
\\=9 - 25i^2$
Use rule (2) above to obtain:
$=9-25(-1)
\\=9+25
\\=34$
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: 15
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