Jake has proved that a function, f(x), is a geometric sequence. How did he prove that?

He showed that an explicit formula could be created.

He showed that a recursive formula could be created.

He showed that f(n) ÷ f(n - 1) was a constant ratio.

He showed that f(n) - f(n - 1) was a constant difference.

Question

Jake has proved that a function, f(x), is a geometric sequence. How did he prove that?

 He showed that an explicit formula could be created.

 He showed that a recursive formula could be created.

 He showed that f(n) ÷ f(n - 1) was a constant ratio.

 He showed that f(n) - f(n - 1) was a constant difference.

kira_yamato · Answer

Remember: $$f(n) = ar^{n-1}, n \in \mathbb{Z^+}$$ 
He showed that f(n) ÷ f(n - 1) was a constant ratio.

anonymous · Answer

Can you help with another?