Question: If A is a 4 x 4 matrix with rows A1, A2, A3, and A4 (in the given order) and det A = 7,

If A is a 4 x 4 matrix with rows A1, A2, A3, and A4 (in the given order) and det A = 7, A1 A2 then det 2A3 + 9A4 2A3 + 6A4 a4) is a 4 4 matrix A = (a1 a2 a3 4 of determinant -8, and let - b1 -2a2 b2 -6a1 - b3 || b4 || 7a4, , -8a2-a4 -5a12a3. Then det (b b b3 b4 ) = = and

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