Islamiyah, W., Suryadi, D., Prabawanto, S., & Gulvara, M. (2023). Learning Obtacles for Junior High School Students on The Concept of Quadratic Equations. Jurnal Cendekia : Jurnal Pendidikan Matematika, 7(3), 2313-2326. https://doi.org/10.31004/cendekia.v7i3.2609