Given

If the Gram-Schmidt process is applied to determine an orthonormal basis for R(A) and a QR factorization of A then, after the first two orthonormal vectors q1, q2 are computed, we have

(a) Finish the process. Determine q3 and till in the third columns of Q and R.
(b) Use the QR factorization to find the least squares solution to Ax = b

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