Name four values of b which make the expression factorable:
x^2 - 3x + b

2, -4, -10 and -18.

Step-by-step explanation:

The given expression is

     ...(i)

We need to find the 4 values of b which make the expression factorable.

A polynomial is factorable if both roots are real.

If are two real roots of a polynomial, then the polynomial is defined as

        ....(ii)

From (i) and (ii), we get

    ...(iii)

For equation (iii), possible pairs of are (2,1), (4,-1), (5,-2) and (6,-3).

From these ordered pairs the values of b are

Therefore, the four possible values of b are 2, -4, -10 and -18.