Question

Hello. I need to find the common difference to find a, b, c and d

Answer 1

The equation is: c = an^3 + bn^2+ cn + d.

Answer 2

I am unsure how to do it.

Answer 3

Is this right?
Equating C3
6a = 1
a = 6

Answer 4

(2^n)*a + (n^2)*b +n*c +d

please delete the previous post, It is unnecessary to tag all of those people in a question. The mere fact you posted a question encourages anyone available to answer if they can