Question

The sum of first n terms of an A.P. is given by (n²

+ 3n). Find the first term & common difference.

Answer 1

Answer:

Sn=n²+3n

S1=1+3

S1=4

S2=4+6=10

First term=4

second term =S2-first term

Second term=10-4=6

Common difference=second term - first term

=6-4 =2

First term=4,common difference=2.