5. (a) Let u = [2 3], A = 6 and w = Express both (uA)w and u(Aw) as sums of products of the entries (without simplifying further). (b) Explain why in general, if u [u u] is a row of length 2, A = a1,1...

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Extracted text: 5. (a) Let u = [2 3], A = 6 and w = Express both (uA)w and u(Aw) as sums of products of the entries (without simplifying further). (b) Explain why in general, if u [u u] is a row of length 2, A = a1,1 a1,2 is a column of height 2, W2 is a 2 x 2 matrix, and w = a2,1 a2,2] we always have (uA)w = u(Aw).