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唔該呀.....
Math 一問....
2008-03-22 5:11 am
回答 (1)
2008-03-22 5:29 am
✔ 最佳答案
y=kx-7---------1y=x^2-10x+9------------2
Sub. 1 into 2
x^2-(10+k)x+16=0
The equation has only one solution
delta=0
(10+k)^2-4(16)=0
k^2+20k+100-64=0
k^2+20k+36=0
(k+2)(k+18)=0
k=-2 or k=-18
收錄日期: 2021-04-25 17:20:46
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080321000051KK02963