## Trending News

# What is the formula for the nth term?: -3, 6, -12, 24...?

### 6 Answers

- Anonymous1 decade agoFavorite Answer
The nth term is (3/2) (-2)^n for n = 1, 2, 3, ,,,,,

-----------------------------------

Formula for nth term of a geometric progression:

(g sub n) = (g sub 1) (r) ^ ( n - 1 )

g sub n = ( -3) (-2) ^ (n - 1 )

g sub n = ( -3 ) [ (-2) ^ n times (-2) ^ (-1) ]

g sub n = (-3) (-2) ^ n times (-1/2)

g sub n = (-3) (-1/2) (-2) ^ n

(g sub n) = 3/2 ( -2) ^ n <------- ANS

- Anonymous1 decade ago
X -2, so the sequence would go -3, 6, -12, 24, -48, 96, -192, 384, -768, 1536, -3072, 6144, etc.

Source(s): a calculator - 1 decade ago
nth term = -2x.

Notice each one of your numbers is twice as much as the last number and is also the opposite sign. So, you must double the last number and then change the sign.

Source(s): Math Teacher!! - How do you think about the answers? You can sign in to vote the answer.
- 1 decade ago
a (sub n) = [(-1)^n](3n) is the correct notation, n being the term (1st, 2nd, etc) and a (sub n) being the value (-3, 6, -12, etc).

- Anonymous1 decade ago
negative two x times the place that you want it starting at negative 3