## Elementary Linear Algebra 7th Edition

Published by Cengage Learning

# Chapter 5 - Inner Product Spaces - 5.1 Length and Dot Product in Rn - 5.1 Exercises: 3

#### Answer

The length of the vector is $3$ units

#### Work Step by Step

Length$=\sqrt {1^{2} +2^{2}+2^{2}}$ $=\sqrt {1+4+4}$ $=\sqrt {9}$ $=3$ since a length must be greater than zero Therefore the length of the vector is $3$ units

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