Undefined Algebraic Fractions A fraction is said to be undefined (or have no meaning) when the denominator = 0. Consider:Solution: determine when the denominator equals 0. Set the denominator = 0 and solve. The NUMERATOR IS IGNORED. It is only necessary to investigate the denominator. The solution to the above example is: x - 1 = 0, or x = 1. The fraction is undefined … [Read more...] about Undefined Algebraic Fractions