更新1:
打少了個x,y=(m-2)x^2+(2m+5)x+(m+1)才對,請看清楚題目是問whether m can be 2?
更新2:
但書的笞案寫m cannot be 2
更新3:
我是說自己的問題打少了個x
中五數學題一問?
2011-08-28 7:35 am
determine whether m can be 2 in y=(m-2)x^2+(2m+5)+(m+1) cuts x axis at two points
回答 (1)
2011-08-31 11:57 pm
✔ 最佳答案
m cannot be 2.When m = 2, the equation becomes
y = (2 - 2)x² + (2*2 + 5)x + (2 + 1)
i.e. y = 9x + 3
The graph is then a straight line, which cuts the x-axis at 1 point only, but not 2 points.
參考: 胡雪
收錄日期: 2021-04-23 20:45:40
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20110827000051KK01283