Question

Find the domain and range og tje ff. Rational function f(x) = 2/x+1

Answer 1

We know that for this to be rational, it first has to be real.

The only case where it is not is when x+1=0 because x/0 is undefined.

Therefore, x≠-1

Meaning all values except -1 is a value of x;

(-infinity, -1) U (-1, +infinity)