It is an arithmetic progression. Elements of the sequence can be identified by substituting the values of n in the expression 3n + 5
2
3,6,9,12.....
is 3n +5 !
28
5, 8, 11, 14 and 17.
3925
3n + 2 + (3n + 3 - 3n + 1) = 3n + 2 + (3n + 3 - 3n + 1) = 3n + 2 + (4) = 3n + 6
nth term
It is 12n2 + 3n - 58
8
3n+2+3n+2=6n+4
-5(3n plus 4) 40 is a set of disjointed expressions: it is not a formula and so cannot be solved.
15n + 5 or 5(3n + 1)