what is the recursive formula for this arithmetic sequence 6, -24, 96, -384

Question

A. a1=6

an=an-1*(-4)

B. a1=6

an=an-1*4

C. a1=4

an=an-1*(-6)

D. a1=4

an=an-1*6

Answer 1

a1=6, r=-4

an =a1(r^(n-1))

an = 6(-4)^(n-1) = the nth term of the GP

answer A is correct, B,C and D all false

an = -4 time the previous term

a1 =6

a2 = 6x-4 =-24

a3 = a2x-4 = 96

a4 = a3x-4 = -384