2-dimensional invariant subspace using Jordan matrix

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If given a matrix which is invertible, and knowing the Jordan canonical form is: $$J = \begin{bmatrix} -2 & 0 & 0 & 0\\ 0&5&0&0\\0&0&-8&0\\0&0&0&8\end{bmatrix}$$ How do you go about finding the two dimensional invariant subspaces?