Except the point is they don't have to know how to solve the quadratic equation. They're given the roots, so it becomes just a matter of plugging in answers. Th

Except the point is they don't have to know how to solve the quadratic equation. They're given the roots, so it becomes just a matter of plugging in answers. That's hardly a test of mathematical ability, and instead asks if you recognize that it's a valid test taking strategy.