The Obstacles Faced by the Learners in the Learning of Quadratic Inequalities. Mediterranean Journal of Social Sciences, [S. l.], v. 5, n. 27 P2, p. 716, 2014. Disponível em: https://www.richtmann.org/journal/index.php/mjss/article/view/5134.. Acesso em: 2 may. 2024.