What is the nth term of the quadratic sequence 7, 14, 23, 34, 47, 62, 79?

First difference in the sequence is:-

7 9 11 13 15 17

second difference = 2 so nth term contains n2

subtracting n^2 from the sequence

7 14 23 34 47

1 4 9 16 25

= 6 10 14 18 22 this is an AP with first term 6 and common diff = 4

so formula is n^2 + (6 + 4 (n - 1)

= n^2 + 4n + 2 answer

are you asking for the 9th term or the 10th term?