Questions like "What are the roots of the equation x^{2}-6x+5=0?" are not testing
understanding if you use the TI-89. But if you give the students the answer that the
roots to a quadratic equation are x=5 and x=1, then you ask the students to give an equation
that will give these answers. This is a kind of jeopardy in math testing: do they really have
the understanding behind the solutions of quadratic equations?