Question

Find an explicit formula for the geometric sequence −1,−7,−49,−343,...-1\,,-7\,,-49\,,-343,... −1,−7,−49,−343

Answer 1

Answer: answer above is correct

Explanation:

khan academy

Answer 2

so we see it times 7 each time
starting with -1

geometric
an=a1(r)^(n-1)
a1=first term
r=common ratio
first term is -1
r=7


`a_n=-1(7)^(n-1)` is the formula
also can look like this:

`f(n)=-1(7)^(n-1)`