Graph the polynomial function f(x) = (x 1)(x +4)? using parts (a) through (e). The y-intercept is |_|. (Simplify your answer. Type an integer or a fraction.) (c) Determine the zeros of the function and their multiplicity. Use this information to determine whether the graph crosses or touches the x-axis at each x-intercept. The zero(s) of f is/are | | (Simplify your answer. Type an integer or a fraction. Use a comma to separate answers as needed. Type each answer only once.) The lesser zero of the function is of multiplicity [| so the graph of f | iy the x-axis at x= [ |. The greater zero of the function is of multiplicity [ |, so the graph off | oy ihe x-axis at x= [ |. (d) Determine the maximum number of turning points on the graph of the function. | (Type a whole number.)