Problem

甲、填充題：共 10 題，每題 8 分，共 80 分。請將答案依題號順序寫在答案卷上，不必寫演算過程。

3. Suppose that the first derivative of $y=f(x)$ is $y'=6(x+1)(x-2)^2$. At what points does the graph of $f$ have a point of inflection? Answer : \underline{\quad(1)\quad}