Answer:
Step-by-step explanation:
1)Since we know that recursive formula of the geometric sequence is

so comparing it with the given recursive formula 
we get common ratio =-4
8th term= 
Explicit Formula =
2) Comparing the given recursive formula
with standard recursive formula 
we get common ratio =-2
8th term= 
Explicit Formula =
3)Comparing the given recursive formula
with standard recursive formula 
we get common ratio =3
8th term= 
Explicit Formula =
4)Comparing the given recursive formula
with standard recursive formula 
we get common ratio =-4
8th term= 
Explicit Formula =
5)Comparing the given recursive formula
with standard recursive formula 
we get common ratio =-4
8th term= 
Explicit Formula =
6)Comparing the given recursive formula
with standard recursive formula 
we get common ratio =-2
8th term= 
Explicit Formula =
7)Comparing the given recursive formula
with standard recursive formula 
we get common ratio =-5
8th term= 
Explicit Formula =
8)Comparing the given recursive formula
with standard recursive formula 
we get common ratio =-5
8th term= 
Explicit Formula =