If the sum of n terms of an A.p is 3n²+5n. And it\'s m t h term is164.find the value of m

If the sum of n terms of an A.p is 3n²+5n. And it\'s m t h term is164

1.	If the sum of n terms of an A.p is 3n²+5n. And it\'s m t h term is164.find the value of m
Answer» Sn=3n2+5nS1=a1=3(1)2+5(1)=8S2=3(2)2+5(2)=22S2=22=a1+a2a2=22-8=14d=a2-a1=14-8=6nth\xa0term value is 164,then what is n?nth\xa0term=a+(n-1)d164=8+(n-1)6164-8 / 6=n-1156/6=n-126+1=nn=27So 27thterm is 164.