12.33. Find the symmetric matrix A belonging to each of the following quadratic forms: (a) $q(x, y, z) = 2x^2 - 8xy + y^2 - 16xz + 14yz + 5z^2$, (c) $q(x, y, z) = xy + y^2 + 4xz + z^2$ (b) $q(x, y, z) = x^2 - xz + y^2$, (d) $q(x, y, z) = xy + yz$
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