Answer
$-35 +20i$
Work Step by Step
RECALL:
(1) $a(b+c) = ac + bc$
(2) $i^2=-1$
Use rule (1) above to obtain:
$=5i(4) + 5i(7i)
\\=20i + 35i^2$
Use rule (2) above to obtain:
$=20i + 35(-1)
\\=20i +(-35)
\\=-35 +20i$
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 7 - Section 7.7 - Complex Numbers - Exercise Set - Page 570: 34
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