#### Answer

$12-i$

#### Work Step by Step

Combine like terms to obtain:
$=(3+9)+(2i-3i)
\\=12+(-i)
\\=12-i$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$12-i$

Combine like terms to obtain:
$=(3+9)+(2i-3i)
\\=12+(-i)
\\=12-i$

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