Suppose ( x + 1 )^2 + ( y - 2 )^2 = 100, where y > 0.
Express y in terms of x.
20分問題 maths
2012-08-22 5:22 am
回答 (1)
2012-08-22 9:20 pm
✔ 最佳答案
(x + 1)² + (y - 2)² = 100(y - 2)² = 100 - (x + 1)²
(y - 2)² = (10 - (x + 1)) (10 + (x + 1))
y - 2 = √[(9 - x ) (11 + x)]
y = 2 + √[(9 - x ) (11 + x)]
2012-08-22 13:22:48 補充：
or
y - 2 = - √[(9 - x ) (11 + x)]
y = 2 - √[(9 - x ) (11 + x)] for √[(9 - x ) (11 + x)] < 2
收錄日期: 2021-04-21 22:25:35
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20120821000051KK00959