Using binomial theorem, expand each of the following:
To find: Expansion of 
Formula used: (i) 
(ii) (a+b)n = nC0an + nC1an-1b + nC2an-2b2 + …… +nCn-1abn-1 + nCnbn
We have, 
We can write 
as 
and 
as 
Now, we have to solve for 
Ans) 
+ 8
+ 28
+ 56
+ 70
+ 56
+ 28(x)1(y)3 + 8
+ (y)4
1