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Quadratic function (二次函数)
├─ Vertex/turning point (顶点)
├─ Axis of symmetry (对称轴)
├─ Discriminant (判别式)
│ ├─ Δ > 0: two distinct real roots
│ ├─ Δ = 0: equal roots
│ └─ Δ < 0: no real roots
└─ Completing the square (配方法)
不要写:3x = 15 → x = 5
要写:Divide both sides by 3: 3x/3 = 15/3 → x = 5
Using the quadratic formula: x = [-b ± √(b²-4ac)] / 2a
Substituting a=1, b=-4, c=3: ...
Factorizing to find the roots: (x-3)(x-1)=0
Therefore, x=3 or x=1.国际竞赛 · AMC8 / AMC10 / IB / IGCSE / AP / A-Level · 留学规划
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