Polynomial question

The zeros for number three are 2 and -1

For number two, a=-2, b=1, c=3, d=4

A for number two is -1/6

For number 2:  Since the zeros occur at -2, 1, 3, and 4, the values are:  a = -2, b = 1, c = 3, and d = 4.

This will create the function:  y  =  A(x + 2)(x -1)(x - 3)(x - 4)

To find the value of A:  Since the value of y = 4 when x = 0, place these into the function:

      y  =  A(x + 2)(x -1)(x - 3)(x - 4)         --->         4  =  A(0 + 2)(0 -1)(0 - 3)(0 - 4) 

                                Simplifying              --->         4  =  A(2)(-1)(-3)(-4)

                                                                              4  =  A(-24)        

                             Dividing by -24          --->      -1/6  =  A

In question 2, you can't say explicitly what the values of a,b,c and d are.

You can say that a takes one of the values, -2,1,3 or 4, then,  having chosen(?) a value for a, b can take any of the three remaining values, and then c either of the two remaining values leaving d to be the last one.