Answer:
Exponential function.
Step-by-step explanation:
We are given that a function of the form

Where
and b>0
Exponential function: The function is of the form

Where b is a positive constant and greater than 0 and x is any real number.
The given function satisfied the define of exponential function.
Hence, the function of the form 
Where b>0 and
are called exponential function.