A1 = {{-4,23,-32,-24},{-7,22,-24,-16},{-1,2,2,-1},{-2,5,-7,0}};
A2 = {{12,-17,22,20},{11,-22,35,32},{2,-6,13,8},{5,-11,14,17}};
MatrixForm[A1]
Eigenvalues[A1]
MatrixForm[A2]
Eigenvalues[A2]