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Eigenvalue and eigenvectors of a 10x10 matrix


I want to do the eigen analysis of the matrix below
mat := {{0, 1, 0, 0, 0, 0, 0, 0, 0, 0}, {-(1 + K + K1), -0.1, K, 0, 0,
     0, 0, 0, K1, 0},
   {0, 0, 0, 1, 0, 0, 0, 0, 0, 0}, {K, 0, -(1 + 2 K + K1), -0.1, K, 0,
     0, 0, K1, 0},
   {0, 0, 0, 0, 0, 1, 0, 0, 0, 0}, {0, 0, K, 0, -(1 + 2 K + K1), -0.1,
     K, 0, K1, 0},
   {0, 0, 0, 0, 0, 0, 0, 1, 0, 0}, {0, 0, 0, 0, K, 
    0, -(1 + K + K1), -0.1, K1, 0},
   {0, 0, 0, 0, 0, 0, 0, 0, 0, 1}, {K1, 0, K1, 0, K1, 0, K1, 
    0, -(1 + 4 K1), -0.1}};

I kept getting a long solution with some Root [] and #1 
I do not know what I am doing wrong
Any help, 
Its very urgent

Thanks



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