Exercise 6 Page 318

• The recursive equation for an arithmetic sequence is a_n=a_(n-1)+d.
• The recursive equation for a geometric sequence is a_n= r* a_(n-1).

We are given the recursive rule below. a_1=3, a_n= - 6 * a_(n-1) Since the recursive equation is of the form a_n= r* a_(n-1), it represents a geometric sequence.