1.

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

Answer»

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


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