Answer:
All real numbers greater than 0.
Step-by-step explanation:
We have the function,
.
'Reflection over y-axis means to flip the graph over y-axis', which changes the function by f(x) becomes f(-x).
So, after reflection, the given function transforms into,

i.e. 
According to the graph of the function g(x), we see that,
Range of
is the 'Set of all real non-negative numbers' i.e. {x | x > 0} i.e. 