Question

the sum of first n terms of an ap is given below then its nth term is 2nsqaure +5n​

Answer 1

Answer:

2(n)^2 +5n =n÷2 ( 2a+(n-1)d)

2n +5 = a+ a+(n-1)d ÷2

4n+10 =a + n th term

nth term =4n +10-a