Question: Let A = 1 2 0 0 0 2 1 0 0 0 0 2 0 1 0 and b = 5 0 3 2

Let A =120002100002010 and b =50321. a. Find A = QR, where Q is an orthogonal matrix and R is upper triangular. b. Use Q and R to find the least squares solution for Ax = b. c. Compute the residual vector r = Ax b and the residual r for the least squares solution.

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