In this study, we identified a mathematics teacher’s scaffolding strategies to support a low-achieving high school students’ quadratic function learning and explored the characteristics of scaffolding used by the teacher from analytic and affective perspectives. From analytic perspective, the characteristics of scaffolding used by the teacher are as follows. First, direction setting and demonstration were used together as the main strategies of analytic scaffolding in early interactions. Second, the direction setting strategy was used to support the development of procedural fluency related to quadratic function learning. Third, by providing feedback in response to the learner's mathematical errors, the learner was able to detect his errors and correct wrong knowledge structures, and for this purpose, various affective scaffolding strategies were used together. From affective perspective, the characteristics of scaffolding used by the teacher are as follows. First, recruitment strategies were continuously used to promote the participation of the low-achieving student in mathematics learning. Second, frustration control strategies were used to minimize potential frustrations experienced by the low-achieving student. Third, it responded to the learner's partial success experience and provided social reinforcement such as recognition and praise along with feedback. As a result of learning process analysis and task-based interview conducted to find out the effect of teacher scaffolding on quadratic function learning of low-achieving student, it was confirmed that some knowledge related to quadratic function were handed over in scaffolding. From the results of the study, implications related to scaffolding for low-achieving students were discussed, and follow-up studies were proposed.