13. Let u = A = [4] and 4-[-28] 1 1 6 Is u in the plane R³ spanned by the columns of A? (See the figure.) Why or why not? 01 u? EL 11 -u? * Where is u? ninima od over orrespondok o form JA Plane spanned by the columns of A IS UTAM bns batolab
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