Question

The fifth term of a geometric sequence is 112 and the ninth term is 1,792. Find the common ratio of the sequence.
A. 2
B. 4
C. 8
D. 16

Answer 1

the answer is A

Answer 2

\(\Large\color{blue}{ \rm 112 \times r^2=1,792\div r^2}\) both sides of the equation are what the 7th term equals to.

Solve for r, and then solve for what what the left (or the right. Same Thing ) equals...

Answer 3

r=2 @SolomonZelman