Question

The sum of an ap is 3n²-4n determine the ap and find its rth term

Answer 1

Answer:

Step-by-step explanation:

Answer 2

on putting n=1,2,3.......
s1=3(1)-4(1)
s1=-1

s2=3(2)-4(2)
s2=-2


s3=3(3)-4(3)
s3=-3


a(n)=s(n)-s(n-1)
a(1)=3

a(n)=s(n)-s(n-1)
a(2)=1

a(n)=s(n)-s(n-1)
a(n)=-1

3,1,-1......

a=3
d=-2