Find an explicit formula for f(n).

Question

f(1)=−71

f(n)=f(n−1)⋅4.2​

Answer 1

f(1) = f(1)(4.2)^0 = -71

f(2) = f(1)(4.2)^1 = -71(4.2)

f(3) = f(2)(4.2) = -71(4.2)^2

f(4) = f(3)(4.2) = -71(4.2)^3

f(n) = f(1)(4.2)^(n-1)

=-71(4.2)^(n-1)