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Unformatted text preview: cofactor expansions of det A . Finally, a matrix is written with its entries enclosed by [ and ], and the determinant of a matrix is written with the entries of the matrix enclosed by | and | . EXAMPLE. Use two dierent cofactor expansions to compute 1-2 1 3-4 5 2 0 . EXAMPLE. Explore the eect of an elementary row operation on the determinant of a matrix. State the row operation and describe how it aects the determinant. " a b c d # , " a + kc b + kd c d # HOMEWORK: SECTION 3.1...
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