標題: [Core] Equation of circle 5**題目with solution [打印本頁]

---

作者: ANYF    時間: 2016-2-17 04:55 PM     標題: Equation of circle 5**題目with solution

If straight line  y= mx+c  passes through the point (1, 2) is the tangent tocircle x^2+y^2- 8x -6y + 21 = 0 .
Find the possible values of m and corresponding c.

(Give your answer to 3 significantfigures)




Solution:
Apart from delta = 0 we can use the following quick method
https://www.youtube.com/watch?v=O8-8uue1Gq4

[ 本帖最後由 ANYF 於 2016-2-17 04:57 PM 編輯 ]

---

作者: alvis00    時間: 2016-2-23 11:10 PM

thanks

---

歡迎光臨 小卒資訊論壇 (http://lsforum.net/board/)

Powered by Discuz! 6.0.0