The Yin Dragon stands in the Yin direction and collects the Yin water, and the Yang dragon stands in the Yang direction and collects the Yang water. In order to purify yin and yang, it is said that the master will be rich and prosperous. It will also be combined with some theories about the life and death of dragons to determine the sitting direction of the dragon.
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Master Ta (寇抠\wei／?: 3 9 ⒐ 6, 1 9, 4)
The known image vertex coordinates of the quadratic function are (3, -2) ,
y=k(x-3)^2-2
The distance between the two intersections of the image and the X-axis is 4
k(x -3)^2-2=0
The absolute value of x1-x2 is 4, which can also be understood as the coordinates of the two points are (5, 0) (1, 0)
(Because the function is symmetric about x=3)
k=0.5
y=0.5(x-3)^2-2=0.5x^2-3x 2.5