Answer:the undefined values or The values of the variables that make the denominator of a fraction equal to zero are called undefined values or singularities. Here's why: - Division by zero is undefined in mathematics. Any number divided by zero results in an undefined answer.- Fractions represent division. A fraction with a denominator of zero represents an attempt to divide by zero, leading to an undefined result. For example, in the fraction 1/(x-2), the value x = 2 would make the denominator zero, resulting in an undefined value. It's important to identify these undefined values when working with fractions, as they can lead to errors or unexpected results in calculations and equations.