Answer
$0$
Work Step by Step
$tr(M)$ of a matrix $M$ is the sum of the entries on its diagonal.
Hence $tr(A)=1+2+(-3)=0$
Differential Equations and Linear Algebra (4th Edition)
by Goode, Stephen W.; Annin, Scott A.
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: 11
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