Question

if the sum of n terms of an ap is 3n2-5​

Answer 1

Answer:

32n _____+_+_+_++_+_+_+_+_+_++_+_+_+_

Answer 2

Answer:

Sn=3n2+5n. S1=a1=3(1)2+5(1)=8. S2=3(2)2+ 5(2)=22. S2=22=a1+a2. a2=22-8=14. d=a2-a1 =14-8=6. nth term value is 164,then what is n?