3. 2 1 1 9. 4 8 For the matrix A 3 -1 %3D 7 8 -1 2 1 1 -2 use Mathematica for find A-1, (b) use Mathematica and A-1 to solve A· X = B¡ where B; is given by 1 4 -1 B1 = 4 B2 B3 = B4 = %3D 5 HO13 3

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