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Dr. avtar chand Best Answer
eigen value of A -1,1,1,-2 eigen value of A² 1,1,1,4 eigen value of A⁴ 1,1,1,16 tr(A)=-1 B=A⁴-5A²+5I (A+B)=A⁴-5A²+A+5I tr(A+B)=tr(A⁴)-5tr(A²)+tr(A)+5tr(I) =19-35-1+15=-2