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A=[tex] \left[\begin{array}{ccc}1&-2\\0&1\\\end{array}\right] [/tex]
1.Determinati B apartine lui [tex]M_{2} [/tex] (R) astfel incat B²=A
2.x apartine lui R astfel incat det(A-xI₂)=0 .Calculati det(A²-xI₂)