The end behavior of the function is \(\boxed{-\infty}\) to the left and \(\boxed{-\infty}\) to the right.
{"axisType": 3, "coordSystem": {"xmin": -3, "xmax": 3, "ymin": -10, "ymax": 10}, "commands": ["y = -x4 + 5*x2 - 4"], "latex_expressions": ["$g(x) = -x^4 + 5x^2 - 4$"]}