Answer
15
Work Step by Step
Recall that if A= $$ and
B= $$, then
A•B= $a_{1}a_{2}+b_{1}b_{2}+c_{1}c_{2}$.
So, $<1,2,1>•<4,3,5>$
$= 1\times4+2\times3+1\times5$= 15
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: 1
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