Find the domain of each function.

And show your steps please.

f(x)=x/x^2+1

f(x)=2x^2/x-3

f(x)=Square root of 5-x

f(x)=x^3/x^2-16

polynomials have domain of all reals

rational functions have domain of all reals except where the denominator is zero

sqrt has domain all x>=0

now show your steps