So then a and b would be subspaces? C would not be because if it is multiplied by zero, the conditions a2+a1+a0=2 would not be satisfied. When b is multiplied by 0 to get 0+0+0, a_1=2_a0 because 0=2(0) and 0=0?
So then a and b would be subspaces? C would not be because if it is multiplied by zero, the conditions a2+a1+a0=2 would not be satisfied. When b is multiplied by 0 to get 0+0+0, a_1=2_a0 because 0=2(0) and 0=0?