The arrangement of 9 elements in 3 rows and 3 columns represent a determinant of order 3, such
The above is the expansion of the determinant along first row.
In general, every square matrix can be associated to an expression or a number which is known
as its determinant. If A =[aij ], where 1<=i, j<=n, is a square matrix of order n, then
the determinant of A is denoted by det A or |A| orsimply