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[數學][高二]座標幾何
http://i773.photobucket.com/albums/yy19/johnson0982/5_zps5b37fa71.jpg<div></div> part a) sub back the 3 points into C , you will get 3 equations , solve them
a = 4 , b = -44 , c = 96
part b) you can use completing square or the vertex coordinate
vertex : (-b/(2a) , (4ac - b^2)/4a)
part c) y = -911 , y = -999 , y = -123456789 關於第一個解abc的題目你也可以假設方程式y=a(x-5.5)^2+c 解開 c就是第二題答案 把方程式化簡就可以得到第一題答案
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