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RESEARCH PAPER
University teachers’ didactic-mathematical knowledge for teaching the effect of coefficient b on the quadratic function
1
Department of Linguistic, Scientific, & Mathematics Education, Faculty of Education, University of Barcelona, Barcelona, SPAIN
Online publication date: 2023-11-05
Publication date: 2023-12-01
EURASIA J. Math., Sci Tech. Ed 2023;19(12):em2370
KEYWORDS
ABSTRACT
Literature shows a tendency to relegate the role of coefficient b to second place in the teaching of the quadratic function. We report an experience with Chilean university teachers, who designed a teaching and learning sequence with this function for construction engineering students. Our focus was on the didactic-mathematical knowledge about the effects of varying coefficient b on the graphical representation of this function that the participating teachers made evident. We constituted a focus group with 10 teachers and then qualitatively analyzed their dialogues using the mathematics teacher’s didactic-mathematical knowledge and competencies model. We highlight the following results: (a) the importance of mathematical knowledge and that of the epistemic facet to interpret the effect of coefficient b on the graphical representation of the quadratic function and (b) the proposal of an interpretation for the graphical behavior of coefficient b that contributes to the teaching of the quadratic function.
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