Casio fx-9750G Matrix Calculations - Manual (Page 19)

109
k k k k k Determinant
The following is the format for obtaining a determinant.
Matrix
Mat A
3 (Det) w
Mat Z
MatAns
Example Obtain the determinant for the following matrix :
1 2 3
Matrix A = 4 5 6
–1 –2 0
3 (Det) 1 (Mat) aAw
This display indicates determinant |A| = –9.
• Determinants can be obtained only for square matrices (same number of rows
and columns). Trying to obtain a determinant for a matrix that is not square pro-
duces an error (Dim ERROR).
• The determinant of a 2
×
2 matrix is calculated as shown below.
| A | =
a
11
a
12
= a
11
a
22
– a
12
a
21
a
21
a
22
• The determinant of a 3
×
3 matrix is calculated as shown below.
a
11
a
12
a
13
| A | = a
21
a
22
a
23
a
31
a
32
a
33
= a
11
a
22
a
33
+ a
12
a
23
a
31
+ a
13
a
21
a
32
– a
11
a
23
a
32
– a
12
a
21
a
33
– a
13
a
22
a
31
1 2 3 4 5 6
Matrix Calculations
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