5n, -n, 7n...
2a-5, 2a+2, 2a+9...
I'm having trouble with the variables. Any problem solving help?
For the simplest n'th term sequence, the formula is where is the difference between the terms, is the first initial term and is the term number. Thus for , the difference between the term ( ) is , the first term ( ) is thus the formula is .
For the second, do you mean ? This would make the difference , the first initial term and thus you would be able to use the n'th term formula.
Hi puzzled,
Are you sure about the first 3 terms of your first sequence? It would be nice if it were:
5n, -n, -7n
Then the common difference would be -6n. You simply add -6n four more times to get your four terms.
In the second one, 2a-5, 2a+2, 2a+9, you have a common difference of 7. Looks like each successive term is 7 more than the previous one. So, just add 7 four more times to get the next four terms.