📚 IGCSE Maths: Quadratic Equations and Graphs | IGCSE 数学：二次方程与图像
Quadratic equations appear throughout the IGCSE syllabus, from algebra to coordinate geometry and modelling problems. Mastering them gives you a reliable set of tools for solving, sketching, and interpreting quadratic relationships.
二次方程贯穿 IGCSE 数学大纲，从代数到坐标几何以及建模问题均有涉及。掌握二次方程可以为你提供一套可靠的工具，用来求解、绘制图像并解释二次关系。
1. Standard Form and Key Terms | 标准形式与关键术语
A quadratic equation is usually written in standard form as ax² + bx + c = 0, where a, b, and c are constants and a ≠ 0. The term ax² is the quadratic term, bx is the linear term, and c is the constant term.
二次方程通常写成标准形式 ax² + bx + c = 0，其中 a、b、c 为常数且 a ≠ 0。ax² 是二次项，bx 是一次项，c 是常数项。
In IGCSE questions, you will often need to rearrange an equation into this form before solving. For example, 3x² = 5x − 2 becomes 3x² − 5x + 2 = 0.
在 IGCSE 题目中，你通常需要先把方程整理成标准形式再求解。例如，3x² = 5x − 2 要写成 3x² − 5x + 2 = 0。
- Quadratic expression: ax² + bx + c
二次式：ax²Published by TutorHao | IGCSE Mathematics Revision Series | aleveler.com
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