Complete parts (a) and (b) for the matrix below. A= -4 -8 1-8 -2 8-4 3 9 4-1 7 -5-7-6-8 05-6 1 لنا (a) Find k such that Nul(A) is a subspace of R. k= 4 (b) Find k such that Col(A) is a subspace of Rk. k=

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