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  1)  E56 = 

  2)  det(B) = 

  3)  C43 = 

  4)  Number of negative eigenvalues =  1 2 3 4 5

  5)  Coeff of x^2/coeff of x^5 = 

  6)Th matrix G is diagonalizable

          Th matrix G is not diagonalizable

 7)  y(1) = 

 8)  x(2)  =