一元二次方程求解

使用方法

1. 1
   填寫各項

   輸入數字或選擇所需選項。

2. 2
   檢視結果

   更改任何值時，答案會立即更新。

3. 3
   使用結果

   複製結果或記下來。不會向任何地方傳送任何內容。

About this tool

Enter the coefficients a, b and c of ax² + bx + c = 0. The solver finds both roots using the quadratic formula, tells you the discriminant and shows the vertex and axis of symmetry. If the discriminant is negative, the roots are shown as complex numbers.

When to use it

Solve ax² + bx + c = 0 and see the roots, discriminant and vertex.

Tips

If the discriminant is negative, there are no real roots.

Privacy

Everything runs in your browser, so your data is not uploaded or stored.

計算示例

With the boxes at their starting values (a (coefficient of x²): 1; b (coefficient of x): -3; c (constant): 2), the tool shows: Discriminant: 1; Vertex: (1.5, -0.25); Axis of symmetry: x = 1.5; Root x₂: 1; Root x₁: 2. Change any box to see your own numbers. The result updates as you type, and nothing leaves your browser.

獲得最佳結果的提示

在相信結果之前先檢查每一個輸入項，因為一個錯誤的數字就會改變整個答案。請使用工資單、賬單、證書或合同上的準確數字，並記下計算日期。稅率、門檻和規則會不時變化，因此對於稅費和法律事務，請將結果視為估算，並與本頁註明的官方來源核對。您可以嘗試任意多個方案；不會儲存或傳送任何內容，重新整理頁面會清空輸入。