Question

the graph of f is given. state the numbers at which f is not differentiable. (enter your answers as a comma - separated list.)

Explanation:

Step1: Recall differentiability condition

A function is not differentiable at a point if there is a corner, cusp, vertical tangent, or discontinuity at that point.

Step2: Analyze the graph

At \(x = 2\), there is a sharp - corner. At \(x= 4\), the function has a vertical tangent.

Answer:

2,4