Résumé
Polynomials are essential objects in mathematics, and hold a fundamental place in education, particularly at the secondary-tertiary transition. Our research focuses on students' conceptions about polynomials, and we present the results of a questionnaire covering three main themes: definition and recognition of a polynomial, equations solving and roots of polynomials, polynomials functions and changes of semiotic register. We identify schemes of high-school and higher education students, and highlight potential underlying difficulties