The Rule of Sarrus is a mnemonic that many people learn for the 3 × 3 determinant formula. To the right of the matrix, copy the first two columns.

Then the determinant is the sum of the three upper-left to lower-right diagonals minus the three lower-left to upper-right diagonals aei + bfg + cdh - gec - hfa - idb. Count the operations involved in Sarrus's formula and in Chiò's.

Transcribed Image Text:

adg adg