Question

Find the 8th term of the geometric sequence 5, -15, 45, ..

Answer 1

Answer:

a=5

r=-15/5=-3

G8=ar^7=5*-3^7 =-2187

Step-by-step explanation:

as always the first term is considered as 'a'

and the 'r' is common ratio of second term over first term

the formula for finding the terms are generally is

ar^n-1 where 'n' is simply the term which we have to find .

hope this will help u

obviously it will help u

Answer 2

Step-by-step explanation:

a=5

r= - 15/5

=-3

8th term=ar*8-1

=ar*7

=5(-3)*7

=5(-2187)

= - 10935

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