Chapter 8 - 8.4 - Vectors and Dot Products - 8.4 Exercises - Page 595: 26

$20$

Work Step by Step

$||u||=\sqrt {u⋅u}=\sqrt {(12i-16j)(12i-16j)}=\sqrt {12^2+(-16)^2}=\sqrt {144+256}=\sqrt {400}=20$

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.