Answer
$k \times (i -2j)=2i+j$
Work Step by Step
Cross product of a vector with itself is zero.
We are given $k \times (i -2j)$
$k \times (i -2j)=k \times i- 2k \times j$
$=k \times i+2j \times k$
$=j+2i$
Hence, $k \times (i -2j)=2i+j$
Calculus: Early Transcendentals 8th Edition
by Stewart, James
Published by
Cengage Learning
ISBN 10:
1285741552
ISBN 13:
978-1-28574-155-0
Chapter 12 - Section 12.4 - The Cross Product - 12.4 Exercises - Page 821: 10
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