8. An observer at (3,6) is watching an object descend the graph y² = x. At what point of it's path is the object closest to the observer.

詳解 (共 1 筆)

助人為本

詳解 #7420436

2026/06/25

所以這題看到函式y^2=x

點設成(y^2,y)

然後找距離最小

用距離平方公式

然後微分

然後令微分等於0

然後試整數根，看誰會等於0

發現y=2成立，所以答案為(4,2)