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What is the happiness index of 20 18 free fortune telling?
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Master Ta (oral color \ micro/? : 3 9 ⒐ 6, 1 9,4)
Solution: 1 From the meaning of the question, we can know that the coordinate of the other intersection of the quadratic function image and the X axis is (-1, 0), and the relationship of the quadratic function is set as y = ax 2+bx+c, which is derived from the known three-point coordinates.
-4=a + b+c
0=a - b+c
0=9a+3b+c
A= 1, b=-2, c=-3, that is, the relationship between functions is y = x 2-2x-3.
2. The quadratic function image can be translated to the right by 1 unit, so that the translated image can pass through the coordinate origin, and the coordinate of the other intersection of the translated image and the X axis is (4,0).
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