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Suppose A in an m x n matrix with linearly independent columns and QR factorization A-QR. Show how the formula for the least-squares solution

Suppose A in an m x n matrix with linearly independent columns and QR factorization A-QR. Show how the formula for the least-squares solution of Ax b (given by Theorem 6.14) can be written using the QR factorization of A. Briefly explain the advantages of the formula you give over the formula given in Theorem 6.14. (7 pts)

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