Answer:
 (0,∞) 
Explanation:
Given: 

It is an exponential function whose base is 9. 
If base is greater than 1 then function is growth exponential. 
Domain: All real value of x. 
Range: It is output value of function we get by putting x. 
For x approaches to infinity , y → ∞
For x approaches to negative infinity, y → 0
Range: All positive real number. 
Range: (0,∞) 
Hence, The range of the given function is (0,∞)