Question

sn=n^2+n, then find the 5th term of the ap​

Answer 1

hope it helps you. thanks for asking

Answer 2

Answer:

Step-by-step explanation:

Sn=n^2+n

n/2(2a+(n-1)d)=n^2+n

2a+(n-1)d=2(n^2+n)/n

2a+(n-1)d=2n(n+1)/n

2a+(n-1)d=2n+2

Let,

n=1

=2a+(1-1)d=2(1)+2

=2a+0=4

2a=4

a=2

Let,

n=2

=2a+(2-1)d=2(2)+2

=4+d=6

=d=6-4

=d=2

a5= a+4d

=2+4(2)

=10