Question

What is the recursive rule for this geometric sequence? 12,−2,8,−32,...                     a1=1/2;an=−4⋅an−1                   a1=−4;an=1/2⋅an−1                           a1=−1/2;an=4⋅an−1                              a1=1/2;an=2⋅an−1

Answer 1

a1=12;an=−4⋅an−1 would be the answer

Answer 2

A=1=-4;an=1/2.an-1 or it might be a1=1/2;an=4.an-1