Question

How do you determine if the equation `y = 2(0.45)^x` represents exponential growth or decay?

Answer 1

Not always decay: Suppose `0<x<1` then as you move left to right on the x-axis you have growth. However, if `x>1`then it decays. If `x<0` and you move from right to left it is decay but should we move left to right instead? In which case it is growth.

Explanation: