Question

Find x such that x + 4, 3x + 9, and 2x + 8 are consecutive terms in an arithmetic sequence

Answer 1

Arithmetic sequence has the same common difference.

Subtract second term from first term and equate it to the difference of third term minus the second term.

Answer 2

And solve for x.

Answer 3

It's supposed to be 3x - 9 not + 9. I tried that and the answer doesn't make sense. I watched my teacher do it a few days ago and his answer was different

Answer 4

The thing about arithmetic sequences is that we want the difference between each number to be the same. Like how 5, 7, 9, 11, 13 is an arithmetic sequence -- the difference between each term is 2

Thus, in order to solve this problem...