Question

Find an equation for the nth term of a geometric sequence where the second and fifth terms are -21 and 567, respectively.

a. an = 7 • (-3)n + 1

b. an = 7 • 3n - 1

c. an = 7 • (-3)n - 1

d. an = 7 • 3n

Answer 1

anyone??

Answer 2

you know formula for nth term of GP?

Answer 3

is it the same formula from the last one??

Answer 4

yes

Answer 5

would it be c

Answer 6

in that formula put an= -21 for n=2
and an=567 for n=5
you will get two equation which contains a1 an r
solve eqationa and find a1 and r.

Answer 7

you have to calculate it.

Answer 8

are you getting?

Answer 9

@thinkallthought ??