Uma abordagem sobre o conceito de função no ensino médio.

Abstract

Teaching the concept of function has been a major challenge for the teachers, particularly during the first year of high school. This issue constitutes, for the student, a cognitive obstacle what contributes to the detachment of mathematics by the students. The abstraction charge contained in the concept of function and the exaggerated formalism in the textbooks does not contribute to the success of the teacher when approaching this issue. It raises the need to know beforehand the approach and method used by the author being essential the analysis of the textbooks by the teacher. Given this fact, this paper proposes a didactic sequence for teaching the concept of functions. It was created an adapted analysis script based on the criteria used in the Plano Nacional do Livro Didático (PNLD) of 2012, in order to examine the methodological approach practiced during the presentation of the definition of function used by teachers in the first year of high school textbooks.