tut9 - Math 136 Tutorial 9 Problems 1: Find the determinant...

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Math 136 Tutorial 9 Problems 1: Find the determinant of the following matrices: a) A = 12 - 11 2 - 2 - 23 1 2 0 1 3 - 6 - 31 , b) B = 1 2 3 4 - - 2 - 1 2 1 2 1 - 1 1 3 1 2: Use Cramer’s rule to solve x 1 - 5 x 2 - 2 x 3 = - 2 2 x 1 +3 x 3 =3 4 x 1 + x 2 - x 3 =1 3: Prove that det A - 1 =
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