20 18 what are the most accurate methods for free fortune telling?
Want to improve as soon as possible, or want to know your fortune.
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Master Ta (oral color \ micro/? : 2 6 ⒏ 3, 1 4,⒌)
1. The symmetry axis is a straight line X = 1, -b/(2a) = 1, and b =-2a.
a & lt0,b & gt0
y=ax^2+bx+c=y=ax^2-2ax+c
The intersection point (x 1, 0) of the parabola and the x axis satisfies 4 > x 1 > 3.
The other intersection point must be on the negative semi-axis of x, and C >;; 0
abc & lt0,3a+b = 3a-2a = a & lt; 0
4 > x 1 > 3, when x = 4, y must be greater than 0, that is, 8a+c >;; 0
a+b = a-2a =-a & gt; 0
All four conclusions are correct.