Question

What is the value of x in the geometric sequence x,2,-1/2,...?

Answer 1

x = 4 1/2

Explanation:

To get to minus 1/2 from plus 2 you would subtract 2 1/2 from 2.

To arrive at x you would add 2 1/2 to 2.

The result is a progression of: 4 1/2, 2, - 1/2

(4 1/2 minus 2 1/2 = 2; 2 minus 2 1/2 = - 1/2)