Finding Common Ratio and Common Difference

To find the next term in a geometric sequence …

• add the common difference d

• multiply by the common ratio r

• subtract the common difference d

• divide by the common ratio r

• common difference

• nth term

• common ratio

• first term

Find the common ratio of the geometric sequence:

64, - 16, 4, - 1, ...

• r = - 8

• r = - 1/4

• r = - 4

• r = 4

Find the common ratio of the geometric sequence:

6, - 6, 6, - 6, ...

• r = 1

• r = - 1

• r = 6

• r = - 6

Find the common ratio of the geometric sequence:

4, -16, 64, -256, ...

• r = - 4

• r = 2

• r = - 2

• r = 4

Find the common ratio of the geometric sequence:

80, 40, 20, 10, ...

• r = 2

• r = -2

• r = 1/2

• r = - 1/2

Find the common ratio of the geometric sequence:

- 2, - 12, - 72, - 432, ...

• r = 8

• r = 9

• r = 6

• r = 12

• 1/x

• x

• - 1/x

• - x

Find the common ratio of the geometric sequence:

• r = x

• r = 5y

• r = xy

• r = 

Find the common ratio of the geometric sequence:

• r = 5

• r = 1/2

• r = 2/5

• r = 5/2