Question: Let X = [l -2 1 6] in R4, and let U = span{[2 1 3 -4], [1 2 0 1]}. (a) Compute projU(X). (b)

Let X = [l -2 1 6] in R4, and let U = span{[2 1 3 -4], [1 2 0 1]}.
(a) Compute projU(X).
(b) Use the basis in part (b) to compute ProjU(X).

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