What is the missing number in the synthetic-division array?

What are the related frequencies to the nearest hundredth of the columns of the two way table? group 1: a-102 b-34group 2: a-18 b-14edited: i don’t have all day to be waiting for an answer. i figured it out.

Find the pattern and use it to list the nth term in the sequence. 6, 12, 20, 30, 42, 56, the nth term of the sequence is

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?