Find the domain of each function.

Question

1. F (x)= x+5÷2-x

2. F (x)= 1÷ x^2-4x-5

Answer 1

1. (x+5)/(2-x) has domain = all real numbers except x=2 as it would make the denominator = 0 which makes the fraction undefined.
2. 1/(x^2-4x-5) = 1/(x-5)(x+1) has domain = all real numbers except x=5 and x=-1, as that would make the denominator =0

this assumes your problem had implicit parentheses, as made explicit above.