Defining the Domain Any fraction that contains a
variable in the denominator has the possibility of being undefined for
some value of the variable. Remember, a “variable” means that the value
for the letter may “vary.” Any value which would make the denominator
equal to zero must be eliminated as a possibility for the variable. To
find such a value, we set the denominator equal to zero and solve. so x cannot equal -3 or x cannot equal 3, since these values would create a zero in the denominator. The views and
opinions expressed in this page are strictly those of Mary Lou Baker. This page was edited on 19-Sep-2007 |