Question: 9. [adapted from Heath 3.5} Let x be a solution to the linear least squares problem min Ax b||, where A = l I] l

9. [adapted from Heath 3.5} Let x be a solution to the linear least squares problem min "Ax b||, where A = l I] l l l l . Let r = b Ax he the corresponding residual vector. Which of the following three vectors is a l 2 3 possible value for r? Why? 1 e H 1 l [bl [3] l 1 [cl 2 L]

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