Question: how to find CharacteristicPolynomiall of matrix with vector entries?

how to find CharacteristicPolynomiall of matrix with vector entries? 

> 

restart

> 

with(LinearAlgebra)

> 

with(ArrayTools)

> 

M := Matrix([[-(I*2)*lambda+I*(lambda+m0), c], [-Transpose(c), I*a+I*(lambda+m0)]])

Matrix(%id = 36893490099698106484)

(1)
> 

P := CharacteristicPolynomial(M, eta)

eta^2+(-I*a-(2*I)*m0)*eta+a*lambda-a*m0+c^2+lambda^2-m0^2

(2)
> 

NULL

> 

NULL

> 

NULL

NULL

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