I need help with part b only. Help

One of the hardest things for students to grasp is the horizontal shift, which we would expect. Let's take a look at a shift that is purely horizontal. Exercise #5: The graph of f (x) is shown below. The function g (x ) is defined by g (x) = f(x-2). (a) Show that x =-1 and x = 2 are zeroes of the function g. (b) Evaluate each of the following using the definition of g and then create a plot of g on the same set axes. 8 (- 3) = 8 (0) = g ( 4) =