Chapter 12 - Data Analysis and Probability - 12-1 Organizing Data Using Matrices - Practice and Problem-Solving Exercises - Page 731: 39

x=4

When finding the excluded value you have to find when the denominator equals zero because that will make the equation undefined. Set the denominator equal to 0: x-4=0 -add 4 to both sides- x=4 The excluded value is 4.