Need help Proving that If $D=P^{-1}AP$ then $A^m = PD^mP^{-1}.$

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The question is in the title, all the above are relevant to Matrices and P is a invertable matrix. Also D would refer to the diagonal matrix and P is a matrix with eigenvectors as it's column entries.

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Hint

$$ \begin{align}D=P^{-1}AP&\iff A=PDP^{-1}\\ A=PDP^{-1} &\implies A^2= PD\color{red}{P^{-1}P}DP^{-1}=PD^2P^{-1}\\ A=PDP^{-1} &\implies A^3= A^2A=PD^2\color{red}{P^{-1}P}DP^{-1}=PD^3P^{-1} \end{align} $$