Question

If the sum of n term of an AP Go is given
by 3² +5n than find it's nth terma​

Answer 1

Answer:

Sn=9+5n

put n=1

S1=9+5

a=14

S2=9+5×2

S2=19

S2-S1=A2

19-14=5

a2=5

d=-9

then it's nth term is

a+(n-1)d

14-9n+9

23-9n answer

hope it will help you