Question

Complete the recursive formula of the geometric sequence 27, -9, 3, -1

b(1)= ______
b(n)= b(n-1)·_____

Answer 1

Explanation:

Common ratio r = a₂/a₁ = -9/27 = -⅓

b(1) = 27

b(n) = b(1)rⁿ⁻¹ = 27(-⅓)ⁿ⁻¹