The excluded values are those values for the variable that result in the expression having a denominator of 0. Factor the numerator and denominator. Find common factors for the numerator and denominator and simplify.

How do you find excluded values?

Explanation: To find the excluded values, find the values that make the denominator equal zero. To do that, set the denominator equal to zero and solve for . Begin by taking each multiple in the denominator and setting it equal to zero.

What is the excluded value of a function?

In a rational function, an excluded value is any x -value that makes the function value y undefined. So, these values should be excluded from the domain of the function. For example, the excluded value of the function y=2x + 3 is –3. That is, when x=−3 , the value of y is undefined.