Determinants . 2 x 2 and 3 x 3 Matrices. 1. 3. -½ . 0. -3. 8. ¼. 2. 0. -¾ . 4. 180. 11. Matrices. Note that Matrix is the singular form, matrices is the plural form!. A matrix is an array of numbers that are arranged in rows and columns.
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2 x 2 and 3 x 3 Matrices
Imagine crossing out the first row.
And the first column.
Now take the double-crossed element. . .
And multiply it by the determinant of the remaining 2x2 matrix
Now keep the first row crossed.
Cross out the second column.
Finally, cross out first row and last column.