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Master Ta (oral color \ micro/? : 3 9 ⒐ 6, 1 9,4)
It is known that the image vertex coordinate of quadratic function is (3, -2),
y=k(x-3)^2-2
The distance between the intersection of the image and the x axis is 4.
k(x-3)^2-2=0
The absolute value of x 1-x2 is 4, and it can also be understood that the coordinates of 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