# Chapter 2 - Matrices - 2.2 Properties of Matrix Operations - 2.2 Exercises: 66

Tr(A)=0

#### 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)=$a_{11}$+$a_{22}$+$a_{33}$+$a_{44}$=1+0+2+(-3)=0

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