please explain the line in ex 3 - on comparing the indices of x in x2 and tr+1 , we obtain r=4.........
Dear Student!
Here is the answer to your query.
Suppose x2 occurs in the (r + 1)th term of the exposition
Comparing the indices or power of x in x2 and Tr + 1 we obtain
Thus x2 occurs in (4 + 1)th term = 5th term
and its coefficient in the expansion of is given by
Cheers!