解二次方程 (圖解法) | Solving Quadratic Equations by Graphical Method

影片內容:

00:22 – y = ax^2 + bx + c 的圖像
04:23 – 圖解法 | graphical method
06:59 – 透過圖像判斷根的數目 | determine the number of roots from graphs

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