Question

Find the formula for the geometric sequence 4, -8, 16, -32

Answer 1

bn=4*(-2)^(n-1) where n is a number of searched term

Explanation:

b1=4 b2=-8

q=b2/b1=-8/4=-2

bn=b1*q^(n-1)

bn=4*(-2)^(n-1) where n is a number of searched term