Elementary Linear Algebra 7th Edition

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: 63

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
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