Current location - Training Enrollment Network - Mathematics courses - 20 13 mathematical model of Jinshan district 2, questions 24 and 3 are answered in detail, and the earlier the answer, the higher the reward.
20 13 mathematical model of Jinshan district 2, questions 24 and 3 are answered in detail, and the earlier the answer, the higher the reward.
kx-y-2k=

The tangent to the center of the circle is (-4.0).

Get the distance from a point to a straight line

D=(6k)/ under the radical sign (k+1)= 1.

Get two values of k

Because the y-axis focus is (0. -2k)

You can do it. The range of b=-2k is

That's all. I wish you a happy study.