What is the range of the function

Question

f(x)=3-2*51^x? Give your answer as an interval.

Answer 1

as x is hugely negative, 2*51^x ---->
so f(x) ----> 3 - 0 or 3
as x becomes hugely positive -2*51^x --->- ∞

do the range is y < 3

I will let you use whatever notation you have learned

Answer 2

forgot the zero in the first line , should read:

as x is hugely negative, 2*51^x ----> 0