What is this answer ? please show all steps

Question

^{Find the domain of f, where f is given below:}

^{a. f(x)=((}√(x-4))/(x^2-1))

b. f(x)=x^3-(1/x+4))+1

Answer 1

a) x may be any number except that which makes the radicand negative and/or the denominator zero

b) x may be any number except that which makde the denominator zero.