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For which value of k does the matrix A = 1 k 4 8 have one real eigenvalue of multiplicity 2? K=___?

For which value of k does the matrix
A =  1  k
       4  8
have one real eigenvalue of multiplicity 2?
K=___?

For which value of k does the matrix
A = 1 k
4 8
have one real engenvalue of multiplicity 2?
K=___?

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