if the sum of n terms of an AP is given by Sn=(3nsquare+4n), find its rth term.

S_n = 3n² + 4n

We know nth term is given by a_n = S_n - S_n-1

Thus, rth term is a_r = S_r - S_r-1

Now, substitute the value of S_r and S_r-1 to get the rth term