Find all local maximum and minimums of the graph. Approximate as needed.

The graph will have local maximum if it changes from increasing to decreasing and a local minimum if it changes from decreasing to increaing. The graph has local maximums at $LaTeX: \displaystyle (4, 8)$ and $LaTeX: \displaystyle (-5.4,12.2)$ . The graph has a local minimum at $LaTeX: \displaystyle (-1, -4)$ .