This is the homework
I have done part a, b, but I don t have any idea how to do the rest
$y = 5$ and $z = 12 $ Those are the eigenvalues of matrix $A$
For part c, and d, I've tried to put some matrix with values in it and its inverse,but it does not match up with the equation of
$$VDV^{-1} = A $$
V isn’t just any arbitrary matrix. They're trying to take you step by step through the diagonalization process in this exercise, so the eigenvectors that you computed in part b are going to come into play here.