HP 48gII Graphing Calculator Manuel d'utilisateur télécharger pdf (Page 338)

The determinant of a matrix

The determinant of a 2x2 and or a 3x3 matrix are represented by the same

arrangement of elements of the matrices, but enclosed between vertical lines,

A 2×2 determinant is calculated by multiplying the elements in its diagonal

and adding those products accompanied by the positive or negative sign as

indicated in the diagram shown below.

The 2×2 determinant is, therefore,

A 3×3 determinant is calculated by augmenting the determinant, an operation

that consists on copying the first two columns of the determinant, and placing

them to the right of column 3, as shown in the diagram below. The diagram

also shows the elements to be multiplied with the corresponding sign to attach

to their product, in a similar fashion as done earlier for a 2×2 determinant.

After multiplication the results are added together to obtain the determinant.

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HP 48gII Graphing Calculator Manuel d'utilisateur Page 338