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Unformatted text preview: A1. We use cofactor expansion along the ﬁrst row to see det( A ) = +1(4 h2 h 2 )1(1218) + 1(3 h 29 h ) = h 25 h + 6 = ( h2)( h3) . Notice this is zero exactly when h = 2 or h = 3. This means that the matrix is not invertible at these values. 1...
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 Fall '10
 Russel
 Linear Algebra, Algebra, Determinant, Addition

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