Answer
$$-8.$$
Work Step by Step
$$(3j+2k)\cdot (i-4k)=3j\cdot i-12j\cdot k+2k\cdot i-8k\cdot k\\
=0+0+0-8=-8.$$
Calculus (3rd Edition)
by Rogawski, Jon; Adams, Colin
Published by
W. H. Freeman
ISBN 10:
1464125260
ISBN 13:
978-1-46412-526-3
Chapter 13 - Vector Geometry - 13.3 Dot Product and the Angle Between Two Vectors - Exercises - Page 666: 10
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