Answer with explanation: 
Given the function f from R  to 
f: 

To prove that  the function is objective from R to  
 Proof:

When we prove the function is bijective then we proves that function is one-one and onto.
First we prove that function is one-one
Let 

Cancel power on both side then we get 

Hence, the function is one-one on domain [tex[(0,\infty)[/tex].
Now , we prove that function is onto function.
Let - f(x)=y
Then we get 

The value of y is taken from 
Therefore, we can find pre image  for every value of y.
Hence, the function is onto function on domain 
Therefore, the given  is bijective function on
 is bijective function on  not on  whole domain  R .
 not on  whole domain  R .
Hence, proved.