Answer
(a) The row vectors are
$$u_1=(4,3,1),u_2=(1,-4,0).$$
(b) The row vectors are
$$ v_1=(4,1),v_2=(3,-4),v_3=(1,0).$$
Work Step by Step
(a) The row vectors are
$$u_1=(4,3,1),u_2=(1,-4,0).$$
(b) The row vectors are
$$ v_1=(4,1),v_2=(3,-4),v_3=(1,0).$$