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Let 1 3 1 3 A = -2 1 (a) Compute an orthogonal basis for Col(A). (b) Find an orthogonal matrix Q and a

Let 1 3 1 3 A = -2 1 (a) Compute an orthogonal basis for Col(A). (b) Find an orthogonal matrix Q and a upper-triangular matrix R (with positive entries on its diag- onal) such that A = QR.

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