Question

if the sum of n terms of an ap is 2n^2+5n then find its 2nd term

Answer 1

$s |n| = 2 {n}^{2} + 5n \\ s |1| = a = 2 + 5 = 7 \\ s |2| = a + a |2| = 2(4) + 10 = 18 \\ a + a |2| = 18 \\ 7 + a |2| = 18 \\ a |2| = 11$
second term =11