Question

if the sum of first m terms of an A.P is 2m2+3m, then what is its second term​

Answer 1

Answer:

So, we get the sum of the first two terms as 14. Hence, we get that the second term of the AP is 9. So, the required answer is 9.

Answer 2

Step-by-step explanation:

sm=2m

2

+3m

sm−1=2(m−1)

2

+3(m−1)

=2(m

2

+1−2m)+3m−3

=2m

2

+2−4m+3m−3

=2m

2

−m−1

∴sm−sm−1=2m

2

−+3m−(2m

2

−m−1)=2m

2

+3m−2m

2

+m+1

=4m+1

General term=am=4m+1

Second term=a

2

=4(2)+1=8+1=9