Which is an exponential decay function?

f(x) = ()x

f(x) = ()–x
f(x) = ()–x
f(x) = ()x

Step-by-step explanation:

Let us understand the exponential function. Here the exponential function is given as under.

Now this is an ever growing exponential function. It never decays unless we have

i) a<1

Hence in this case the function will decays

example

or

ii) x is a negative power.

Example

Now in our problem , the second and third options are same. Hence both can be true. So our answer is b

b)

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