A 4th-degree polynomial function has the general form y = (x4 + bx3 + cx2 + dx + e for real values of a, b, c, d, and e, where a ( 0. Graph several 4th-degree polynomial functions by trying different values for each coefficient. Be sure to include positive, negative, and zero values. Make a sketch of each different type of curve you get. Concentrate on the shape of the curve. You do not need to include axes in your sketches. Compare your graphs with the graphs of your classmates, and come up with six or more different shapes that describe all 4th-degree polynomial functions.