Let 2x2 matrix M=[-5 2/ -2 -5]. Find formulas for the entries of M^n, where n is a positive integer.Start by diagonalizing M, i.e. find Q and D such that Q^(-1)MQ=D. Then M=QDQ^(-1), and so M=QD^nQ^(-1). Note that you will get complex eigenvalues, but since the entries of M are real, the entries of M^n must also be real. You might find it helpful to write complex numbers in polar form re^(ia), and to use the formula e^(ia)=cos(a)+isin(a).
Question
Let 2x2 matrix M=[-5 2/ -2 -5]. Find formulas for the entries of M^n, where n is a positive integer.Start by diagonalizing M, i.e. find Q and D such that Q^(-1)MQ=D. Then M=QDQ^(-1), and so M=QD^nQ^(-1). Note that you will get complex eigenvalues, but since the entries of M are real, the entries of M^n must also be real. You might find it helpful to write complex numbers in polar form re^(ia), and to use the formula e^(ia)=cos(a)+isin(a).
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