F4 maths 一元二次方程
回答 (1)
2012-12-15 7:00 pm
✔ 最佳答案
For unequal real roots, delta > 0(-4k)^2 - 4(4)k(k - 1) > 0
16k^2 - 16k(k - 1) > 0
k^2 - k^2 + k > 0
k > 0
That means k can be any value greater than zero, that is k can be any positive number.
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https://hk.answers.yahoo.com/question/index?qid=20121215000051KK00056