8. a. The graph in the accompanying figure is made of line
segments joined end to end. At which points of the
interval [-4, 6] is f' not defined? Give reasons for
your answer.
b. Graph the derivative of f. The graph should show a
step function.
(-4,0)
(0, 2)
1
(1, -2)
y = f(x)
(4,-2)
(6. 2)
6
[§3.2-31]
