# Question #5d2f2

$8 x$+1
It can be seen that each successive term is bigger than the previous one by $x$. This is the common difference . It can also be found by subtracting a term from the next one. $3 x + 1 - \left(2 x + 1\right)$ results in $x$.
This means that the number of a term is the same as the co-efficient of $x$. 1 is added each time. The 8th term will be $8 x$+1