Unformatted text preview: Using the cofactor expansion with respect to the ﬁrst column of this matrix, the determinant is (1) det ± 31 4 ² . Proceeding in this way, we see that the determinant of this matrix is the product of its diagonal entries, (1) · 3 · 4 =12 . 2.5.17. Cofactor expansion with respect to the ﬁrst column gives det A = 0 . Thus the matrix is not invertible. 2.5.18. Answer: 11 01 1 1 . 1...
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 Spring '08
 Anshelvich
 Math, Linear Algebra, Determinant, Invertible matrix, Det, Laplace expansion

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