(I) Identity used in this question=(a-b)^2=a^2-2ab+b^2

(9.8)^2

We can write (9.8)^2= (10-0.2)^2

Therefore, (10-0.2)^2=10^2-2(10)(0.2)+0.2^2=100-4+0.04

Hence the answer is 96.04

(ii) Identity used in this question=[(a+b)^2=a^2+a+2ab]

(103)^2

=(100+3)^2

=(100)^2+3^2+2.100.3

=10000+9+600

=10609

Hence the answer is 10609