I NEED SOLUTION PLZ
更新1:
i dont know how to calculate the centre of the circle= =
f5 maths
2010-04-02 12:27 am
If the centre of the circle x^2 + y^2 + kx + (k+1)y -3 = 0 lies on x+y+1 = 0 ,find k.
I NEED SOLUTION PLZ
I NEED SOLUTION PLZ
回答 (2)
2010-04-02 2:40 am
✔ 最佳答案
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http://j.imagehost.org/0594/ScreenHunter_01_Apr_01_18_39.gif
2010-04-01 18:42:24 補充：
x^2 + y^2 +Dx+Ey+F=0
the centre of the circle=(-D/2 , -E/2)
2010-04-02 12:33 am
Centre of circle = (k,k+1)
Substitute (k,k+1) into the equation x+y+1 = 0,
k + k+1 +1 = 0
2k + 2 =0
k = -1
Substitute (k,k+1) into the equation x+y+1 = 0,
k + k+1 +1 = 0
2k + 2 =0
k = -1
收錄日期: 2021-04-23 20:41:35
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100401000051KK01078