If and , find the common domain where the functions and are equal.
The domain of an algebraic fractional function is , because a fraction is not defined when the denominator is 0.
Find the zeros of the denominator.
So, the domain of is .
Factorise the numerator and denominator.
Find the zeros of the denominator before we simplify .
Now we can simplify by removing the common factor of .
which is the same as .
So, for the common domain .