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1. Let 1-1 4 1 1 4-2 1 -1 0 (a) Find the (reduced) QR factorization of A by hand. That is, A = QR,

1. Let 1-1 4 1 1 4-2 1 -1 0 (a) Find the (reduced) QR factorization of A by hand. That is, A = QR, where Q is a 4 by 3 left-orthogonal matrix and R is a 3 by 3 upper-triangular matrix. (b) Verify your answer using the MATLAB function QRfactoir

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