Write the explicit formula for the geometric sequence.

a1 = -5 a2 = 20 a3 = -80

a. an = -5 • (-4)n

b. an = -5(-4)n-1

c. an = -4(-5)n-1

d. an = -5 • (4)n

We are given the series of a1 = -5 a2 = 20 a3 = -80. In this case, we can see that this is a geometric sequence with a geometric ratio equal to 20/-5 = -80/ 20 or equal to 4. Hence, r is equal to 4, a1 is equal to -5. 

The geometric sequence formula is an = a1*r^(n-1) = -5 * (-4)^ (n-1) where n is an integer. Answer is B.

I’m a smart person so that’s why i think it was 6