Differential Equations and Linear Algebra (4th Edition)

Published by Pearson
ISBN 10: 0-32196-467-5
ISBN 13: 978-0-32196-467-0

Chapter 2 - Matrices and Systems of Linear Equations - 2.1 Matrices: Definitions and Notation - Problems - Page 121: 12

Answer

$-1$

Work Step by Step

$tr(M)$ of a matrix $M$ is the sum of the entries on its diagonal. Hence $tr(A)=2+2+(-5)=-1$
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