Question

What is the nth term rule of the quadratic sequence below?

−7, −6, −3, 2, 9, 18, 29
can you please write the explanation please (not needed but would be appreciated :)

Answer 1

for the very first one you add one to -7 but then with that one you add two more to get the next answer (-3) then you add 3 plus two more to get the next answer (2) then you add that 5 that you added the last plus two more to get the next answer (9) then you add that 7 plus two more and skk on so and so on