Quadratic Inequalities Self-Test: Interactive Graphing with Color Feedback

① This interactive GeoGebra example serves as a self-test for quadratic inequalities, allowing users to input coefficients and constants to dynamically see the corresponding quadratic function graph and the shaded solution regions, with immediate feedback. ② Core mathematical concepts include quadratic functions, quadratic inequalities, interval notation on the number line, discriminant and root relationships, and the geometric interpretation of solution sets. ③ Construction highlights: commands such as Element, Textfield, Length, and Polygon are used to create text input fields and dynamic polygon regions; objects include text1 through text8, ineq1, ineq2, and numerous color objects (e.g., colorineq11R, colorineq12B) to distinguish shaded regions for different inequalities; conditional logic via textcon1, textcon2, and context provides feedback. ④ Suitable for high school students practicing quadratic inequalities independently, or for teachers demonstrating in class and for after-class self-assessment, helping learners intuitively connect solution sets with graphs.