If $A,B\in \mathbb{C}^{n,n}$ are similar, does it imply that $\det(A+3I)=\det(B+3I)$?

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If $A,B\in \mathbb{C}^{n,n}$ are similar, does it imply that $\det(A+3I)=\det(B+3I)$? If so, why? I know that $\det(A)=\det(B)$.

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Suppose $PAP^{-1}=B$. Then $P(A+3I)P^{-1}=PAP^{-1}+3PIP^{-1}=B+3I$.