Phyllis has a problem. She knows that the roots of a quadratic function are
Mercedes says, “Just remember when we made factors from the roots. If the roots are
and the equation is .” Use Mercedes’s idea to help Phyllis write the equation of a quadratic function.
Darin says, “No, no, no. You can do it that way, but that’s too complicated. I think you just start with
and work backwards. So , then, square both sides… Yeah, that’ll work.” Try Darin’s method.
Whose method do you think Phyllis should use? Explain your choice.