give the matrix A = {(1, -2, -4, 3 , -2), (0 , 3, 9, -12 , 12), (0, 0, 0, 0,0) (0, 0, 0, 0, 0)} a. find bases for the subspace Col A , Row A , Nul A . justify your answers
b. find dim(Col A) , dim(Row A ), and dim (Nul A)
c. Find rank(A )+ dim(Nul A)