1 Answer

Eking · Answer 1 · 2020-07-26T18:47:30+0000

Answer:
$\bold{(B)\ a_n=-5(a_(n-1))\quad a_1=9}$

Explanation:

The explicit rule for a geometric sequence is:
$a_n=a_1(r)^(n-1)\ \text{where}\ a_1\ \text{is the first term and r is the ratio}$

The given explicit rule shows that
$a_1=9\ \text{and}\ r=-5$

The recursive rule for a geometric sequence is:
a_n=r(a_(n-1))

So, the recursive rule is:
a_n=-5(a_(n-1))

Please log in or register to add a comment.