Question

Write an equation for the nth term of the given geometric sequence
-12,-36,-108...an

Answer 1

nth term of the geometric sequence

an= -12*3^(n-1)

Explanation:

First term

a= -12

Second term

ar= -36

-12r=-36

r=-36/-12

=3

Third term

ar^2= -108

-12(3)^2

= -12(9)

= -108

nth term of the geometric sequence

an=ar^(n-1)

= -12*3^(n-1)