Which of the following represents the general equation for the geometric sequence? -1, -2, -4, ... an = 1 · 2n - 1 an = -2n - 1 an = 2n - 1 an = 1 · 2n + 1

-1,-2,-4

an = a1 * r^(n - 1)
a1 = first term = -1
r = common ratio = 2

so the equation would be : an = -1 * 2^(n - 1)