Question

Given the recursive formula for the sequence a1=-1,an=an-1*(-4)

Answer 1

The first few terms of the sequence are:

a1 = -1
a2 = a1*(-4) = -1*(-4) = 4
a3 = a2*(-4) = 4*(-4) = -16
a4 = a3*(-4) = -16*(-4) = 64
a5 = a4*(-4) = 64*(-4) = -256

So, the sequence is:
-1, 4, -16, 64, -256, ...