Find a basis for the row space of aa, a basis for the column space of aa, a basis for the null space of aa, the rank of aa, and the nullity of aa. (note that the reduced row echelon form of aa is ⎡⎣⎢⎢⎢1000−40000100−4−4000−300⎤⎦⎥⎥⎥[ 1−40−40001−4−30000000000].)