Answer
$18$
Work Step by Step
Use the FOIL method to multiply the binomials.
$2+4i\sqrt{2}-4i\sqrt{2}-16i^2$
Substitute $-1$ for $i^2$. Also, add/subtract like terms.
$2-16(-1)$
Simplify.
$18$
College Algebra (11th Edition)
by Lial, Margaret L.; Hornsby John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671791
ISBN 13:
978-0-32167-179-0
Chapter 1 - Section 1.3 - Complex Numbers - 1.3 Exercises - Page 103: 62
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