Formative Assessment 1087

Assessment Problem: 

Is there a value for x that will make (2x – 6)(x – 3) < 0 true? 

Mathematical Issues: 

Can students reason to an answer without trying to solve the inequality? They must think about zero and negatives in order to accurately address the problem.

Algebraic Relations
Thinking about Inequalities
Common Core Standards: 
Encyclopedia Entry:
Research References: 
Lim, K. H. (2006). Characterizing students' thinking: Algebraic inequalities and equations. Paper presented at the 28th annual meeting of the North American Chapter of the International Group for the Psychology of Mathematics Education, Mérida, México: Universidad Pedagógica Nacional.