Linear Algebra: A Modern Introduction

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

Chapter 4 - Eigenvalues and Eigenvectors - 4.2 Determinants - Exercises 4.2 - Page 281: 9

Answer

-12

Work Step by Step

By using the cofactor expansion along the first row: $det\begin{vmatrix} -4& 1&3\\ 2&-2 &4\\ 1&-1 &0 \end{vmatrix}$ $=+(-4)\times det\begin{vmatrix} -2 &4\\ -1 &0 \end{vmatrix}-1\times det\begin{vmatrix} 2 &4\\ 1&0 \end{vmatrix}+3\times det\begin{vmatrix} 2&-2\\ 1&-1 \end{vmatrix}$ $=-4(0+4)-1(0-4)+3(-2+2)$ $=-16+4+0$ $=-12$
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