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The eigen values of a $3 \times 3$ matrix $\mathrm{P}$ are $true$ then $\mathrm{P}^{-1}$ is:

$-\frac{1}{2}\left(P^{2}+3 P\right)$

$-\frac{1}{4}\left(P^{2}+2 P\right)$

$\frac{1}{2}\left(P^{2}-2 P\right)$

$\frac{1}{4}\left(3 P-P^{2}\right)$