The numbers at which f is not differentiable are; -1, and 2
The reason the above list of numbers at which f is not differentiable are correct are given as follows:
Question; Please find attached a graph that can be used to solve the question
Therefore, the given graph of f shows that the function is not differentiable at x = -1, the point where the graph has a discontinuity
The graph of f has a kink at x = 2, therefore, the function is also not differentiable at x = 2
Learn more about differentiability of a function here:
https://brainly.com/question/18187058
