Find all eigenvalues of the matrix A=(4114)A = \begin{pmatrix} 4 & 1 \\ 1 & 4 \end{pmatrix}A=(4114).
λ=3,5\lambda = 3, 5λ=3,5
λ=2,6\lambda = 2, 6λ=2,6
λ=1,8\lambda = 1, 8λ=1,8
λ=4,4\lambda = 4, 4λ=4,4