given 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 the bases for the subspaces Col A , Row A and Nul A . justify your asnwers.
b. Find dim(Col A), dim(Row A) and dim(Nul A) . justify your answers
c. Find rank (A) and dim(Nul A)