Electronic Proceedings of the Thirteenth Annual Conference on Technology in Collegiate Mathematics



CONTRIBUTED PAPER: 13-C32

How to make tests for students that are using CAS tool (TI89)

Bengt Ahlander
Solangen 4613
46193 Trollhattan
Sweden
Phone: +46520421900
Fax: +46520421901
E-mail: ba@ostrabo.uddevalla.se

ABSTRACT

Questions like "What are the roots of the equation x2-6x+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?