Let 2 be an eigenvalue of a square matrix of order 3, then a ^ 2 must have an eigenvalue?

Knowledge point: if a is the eigenvalue of a and G (x) is the polynomial of X, then G (a) is the eigenvalue of G (a)
Your topic: G (x) = x ^ 2, G (2) = 2 ^ 2 = 4, G (a) = a ^ 2
So 4 is the eigenvalue of a ^ 2
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