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Question: 4 15 pts least squares problem let a be an...

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4 (15 pts) Least squares problem Let A be an m × n matrix with rank(A) n. Suppose that the columns of A are orthogonal. Show that the least squares solution of the system Ax - b is given by bl a1 a1 a1 bT a2 bTam an where ai denotes the i-th column of A

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