How do you state the excluded value of function?

To state the excluded values of a function, identify any values of the variable that would make the function undefined. Common examples include values that cause division by zero or result in taking the square root of a negative number. Once identified, express these values clearly, often in interval notation or as a list. For instance, in the function ( f(x) = \frac{1}{x - 3} ), the excluded value is ( x = 3 ) since it would make the denominator zero.