6,-12,24,-48

Question

This is a  geometric sequence  it is a recursion formula there are 2 blanks for me to fill in an + __  (___) ^n-1

Answer 1

nth term:

A(n)=a(r)^[n-1] is the formula where a=first term and r=common ratio

the an should be A(n) and the + sign should be an = sign

Answer 2

a_n+1 = a_n(-2)

 

a_n = 6(-2)^n-1