Find an invertable matrix P such that $P^{1} $ is diagonal.
Find an invertable matrix P such that $P^{1} $$AP$ is diagonal. Hint: use eigendecomposition.
$\begin{matrix} 4 & 0 & 0 \\ 3 & 2 & 0 \\ 0 & 2 & 1 \end{matrix} $

Are you sure the question statement is correct ? Is it P inverse or D as per diagonalization

If the given matrix is A then you need to find A= PD(P^1) where P is invertible and D is diagonal?

Sorry, missed it in the formula creator

Okay so basically we need to do a decomposition
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