[2 1] -61 Let A 1 and b = . The QR factorization of the matrix A is given by: 2 1 6. 1 3 1 1 1 3 2 1 3 V2 | 3 (a) Applying the QR factorization to solving the least squares problem Ax = b gives the system: 3 X = V2 3 (b) Use backsubstitution to solve the system in part (a) and find the least squares solution. ||

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