13. Let u 0 -[8] = 4 and A = 14. Let u = u? spanned by the columns of A? (See the figure.) Why or why not? Where are u? 3-5 6 1 -2 2 -3 and A = 2 Is u in the plane in R³ 3 u? [58 0 1 1 3 0 of R3 spanned by the columns of A? Why or why not? Plane spanned by the columns of A 7 -1 Is u in the subset

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