Which formula can be used to describe the sequence?, homework help

Which formula can be used to describe the sequence?, homework help

64, –48, 36, –27, …

Which formula can be used to describe the sequence?

f(x + 1) = f(x)

f(x + 1) = f(x)

f(x) = f(x + 1)

f(x) = f(x + 1)