四大空間的orthogonal basis

(a) Find the SVD of A =
┌3 2 2┐
└2 3 -2┘
(b) Use (a) to find an orthogonal basis for each of the four subspaces
R(A), C(A), N(A), and N(A^T)

請問要怎麼使用SVD 去找 四大空間的orthogonal basis
完全沒有頭緒