## jesusfreak find the 10th term of the geometric sequence. -0.125, 0.25, -0.5, 1, -2 2 years ago 2 years ago

1. satellite73

looks like $a_n=\frac{1}{8}\times (-1)^k(2)^{k-1}$

2. satellite73

probably could be more elegantly written

3. satellite73