Question: (2) Let A c Rmix and let a be a solution of the least squares problem Ar = b. Show that a vector y c

(2) Let A c Rmix" and let a be a solution of the least squares problem Ar = b. Show that a vector y c R" will also be a solution if and only if y = a + z, for some vector z c N(A). JHINT: N(A"A) = N(A)I

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