Problem

甲、填充題：共 8 題，每題 8 分，共 64 分。請將答案依題號順序寫在答案卷上，不必寫演算過程。

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