The maths" problems.(20)

👨🏻‍🏫 學術台數學

[匿名]

2010-04-24 9:27 pm

don"t know how to do it.
And it was very important for me.
Can anyone help me ?

Find the possible value(s) of k
if kx^2 + 4x + (3k-1) = 0

很急...如果有人識的話可以在這裡教教我嗎...
20點!!!

更新1:

Find the possible value(s) of k if kx^2 + 4x + (3k-1) = 0 has two equal real roots.

回答 (4)

用戶7639

2010-04-24 10:53 pm

✔ 最佳答案

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http://j.imagehost.org/0110/ScreenHunter_03_Apr_24_14_52.gif

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[匿名]

2010-04-24 10:56 pm

two equal real roots. → Δ = 0 = B^2 - 4AC
4^2 - 4(k)(3k-1) = 0
16 - (12k^2 - 4k)=0
16-12k^2+4k=0
k=(1+1/3) or k=-1(rej.)

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[匿名]

2010-04-24 10:24 pm

Find the possible value(s) of k
if kx^2 + 4x + (3k-1) = 0 has two equal real roots.

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知識就是力量

2010-04-24 10:21 pm

問題是否已完全盡錄

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