Linear Algebra: A Modern Introduction

Published by Cengage Learning
ISBN 10: 1285463242
ISBN 13: 978-1-28546-324-7

Chapter 1 - Vectors - 1.1 The Geometry and Algebra of Vectors - Exercises 1.1 - Page 17: 20

Answer

$\begin{bmatrix} -2\\3 \end{bmatrix}$

Work Step by Step

$u=\begin{bmatrix} -2\\ 1 \end{bmatrix}\;\;\;\;\;v=\begin{bmatrix} 2\\-2 \end{bmatrix}\\\\ w=-u-2v\;\;\;{\color{Red}\Rightarrow } \;\;\;\;w= -\;\begin{bmatrix} -2\\ 1 \end{bmatrix}\;\;-\;\;2\begin{bmatrix} 2\\-2 \end{bmatrix}\\\\ w=\begin{bmatrix} 2\\-1 \end{bmatrix}\;\;-\;\;\begin{bmatrix} 4\\-4 \end{bmatrix}\\\\ w\;\;=\;\;\begin{bmatrix} 2-4\\-1-(-4) \end{bmatrix}\;\;\;=\;\;\;\begin{bmatrix} -2\\3 \end{bmatrix}$
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