Question

Using suitable identity and evaluate the following (a) (103)2

Answer 1

(103)2
= (100+3)2
= (100*100+3*3+2*100*3)
= (10000+9+600)
= (10609)
Identity used here is a2+b2+2ab=(a+b)2

Answer 2

(100+3)2
using indentity (a+b)2=a2+b2+2ab
(100)2+(3)2+2(100)(3)
10000+9+600
10609