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

Respuesta :

apologiabiology
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

[tex]a_n=-1(7)^{n-1}[/tex] is the formula
also can look like this:
[tex]f(n)=-1(7)^{n-1}[/tex]

Answer: answer above is correct

Step-by-step explanation:

khan academy

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