<u><em>note this isn't the only possible answer; read below.</em></u>
Step-by-step explanation:
For quadratic formulas when you foil the equation you can easily identify the root values by setting them equal to 0 and solving for X. Note that a quadratic is of 2 degree so you get 2 root values. Now, instead of 2, you have 3.
So... they give you the zeros x=2 and x=-1, now add your own random x value.