Question

the sum of n terms of an ap is given by 3n^2 + 2n find common diiference

give explanation not just answer​

Answer 1

Answer:

Sn=3n^2+2n

put n=1

Sn=3+2

Sn=5

Sn=a1=5

put n=2

Sn=12+4=16

a2=S2-S1

a2=16-5

a2=11

d=a2-a1

d=11-5

d=6