Question

If the sum of first k terms of an ap is 2k²+3k, then find the 2nd term​

Answer 1

Answer:

9

Step-by-step explanation:

d=common difference , f=first term , n=number of term

general formula of sum (n terms) =d/2 (n^2)+(f-d/2)n

here sum=2k^2+3k

ie,2n^2+3n

so here d/2=2 and therefore d=2*2=4

also

f-d/2=3

subsiding d/2 we get

f-2=3

f=2+3=5

therefore 2nd term =first term +common difference=5+4=9