Question: 0.5 -0.5 0.5 -0.5 Let A = Note that the columns of A are 0.5 0.5 0.5 0.5 orthonormal (why?). (a) Solve the least squares

0.5 -0.5 0.5 -0.5 Let A = Note that the columns of A are 0.5 0.5 0.5 0.5 orthonormal (why?). (a) Solve the least squares problem Ax = b where 3 CO b = 3 X = (b) Find the projection matrix P that projects vectors in R4 onto R(A) P = (c) Compute Ax and Pb Ax = Pb =

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