23. f has a relative maximum value of at. f has a relative minimum value of at.

Explanation:

Step1: Identify relative maximum

Observe the graph for peaks. The highest - point in a local region is the relative maximum. Here, the function $y = f(x)$ has a relative maximum value of 3 at $x = 0$.

Step2: Identify relative minimum

Observe the graph for valleys. The lowest - point in a local region is the relative minimum. Here, the function $y = f(x)$ has a relative minimum value of - 1 at $x=-2$.

Answer:

f has a relative maximum value of 3 at 0. f has a relative minimum value of - 1 at - 2.