find the value of k if each of the following quadratic equations has a double real root
x^2 + 4kx + 16k + 20 = 0
有一條數唔識!!
2007-10-11 1:39 am
回答 (1)
2007-10-11 1:57 am
✔ 最佳答案
(4^2)-4(1)(16k+20)=016-4(16k+20)=0
16-64k-80=0
k=-1
收錄日期: 2021-04-23 22:02:54
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https://hk.answers.yahoo.com/question/index?qid=20071010000051KK02208