Question

一动点p的纵坐标比它到点（3,3）的距离少2,求懂点p的轨迹方程.

Answer 1

设P(x,y)

则依题意有y=√[(x-3)^2+(y-3)^2]-2

所以(y+2)^2=(x-3)^2+(y-3)^2

即x^2-6x+14-10y=0