Question

What is the 9th term of the geometric sequence where a1 = -7 and a6 = -7,168?

Answer 1

a6 = 168 ?

Answer 2

what?

Answer 3

Sorry I can't understand the given ?!

Answer 4

what given?

Answer 5

a1 = -7 what else is given to solve this problem ? value of a6 ?

Answer 6

a6= -7168

Answer 7

so the GS (a, ar , ar^2 ,...)
so a = a1 = -7
a6 = \[ar ^{5}\]
-7168=-7 * r ^5
r=4
a9 = ar^8 = (-7)(4^8)= -458752

Answer 8

thank you!

Answer 9

urw :)