Answer
$-4$
Work Step by Step
$2 \textbf i+ 4\textbf j=<2,4>$
$0 \textbf i-1 \textbf j=<0,-1>$
$(2 \textbf i+ 4\textbf j)\cdot (0 \textbf i-1 \textbf j)=<2,4>\cdot <0,-1>=
2\times 0+4\times (-1)=0-4=-4$
Trigonometry (11th Edition) Clone
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
978-0-13-421743-7
ISBN 13:
978-0-13421-743-7
Chapter 7 - Applications of Trigonometry and Vectors - Section 7.5 - Applications of Vectors - 7.5 Exercises - Page 343: 52
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