Answer
Tr(A)=2
Work Step by Step
The trace of a matrix is defined as the sum of the diagonal elements (upper left corner to bottom right corner) in a square matrix.
Tr(A)=$a_{11}$+$a_{22}$+$a_{33}$=1+(-2)+3=2
Elementary Linear Algebra 7th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
1-13311-087-8
ISBN 13:
978-1-13311-087-3
Chapter 2 - Matrices - 2.2 Properties of Matrix Operations - 2.2 Exercises - Page 61: 63
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