Answer:
The domain for n is n≥1, where n∈Z or all natural numbers.
Step-by-step explanation:
The first term of a geometric sequence is [tex]a_1=-1[/tex] and the common ratio is 7.
The nth term of a G.P. is
[tex]a_n=a_1r^{n-1}[/tex]
It can be written as
[tex]f(n)=a_1r^{n-1}[/tex]
[tex]f(n)=-1(7)^{n-1}[/tex]
[tex]f(n)=-(7)^{n-1}[/tex]
This function is defined for all n≥1, where n∈Z.
Therefore the domain for n is n≥1, where n∈Z or all natural numbers.
