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.
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