Question

Help, photo attached. It's about functions

Answer 1

@AkashdeepDeb

Answer 2

I can tell you about the Domain, Not sure about Range though.
The expression tells us that the denominator cannot be 0
so x cannot be = 4
x cannot be lesser than 4 also because then it will be sqrt(negative number) which is a complex/imaginary number..
So it's domain must be
(4,infiniti)