State whether (e^4-x) + 2 is an exponential growth function or an exponential decay function. Explain why.
I want to use the formula f(x) = ae^kx where a>0, and k<0.
The Attempt at a Solution
I know it is an exponential decay formula because the limit as x goes to -inf. = inf. and the limit as x goes to inf. = 2. But I do not know how to describe what a and k are in this equation to show it is an exponential decay function.