Use a graphing utility with the specified window to graph each equation.

1. y = x3 - 12x - 1

x-min = -5, x-max = 5;

y-min = -20, y-max = 20

2. y = x4 - 4x3 + 6

3. x-min = - 4, x-max = 6;

4. y-min= - 40, y-max = 10