更新1:
why product of roots is α^2 - 2α = - 48
F.4 Maths
2013-10-04 6:30 pm
Given that α and α – 2 are the roots of the equation x2 + (3k – 2) x + 48 = 0. (a) Find the values of α(b) If α>0, find the value of k.
回答 (4)
2013-10-04 7:30 pm
✔ 最佳答案
(a) product of roots= α^2-2α=48α^2-2α-48=0
(α-8)(α+6)=0
α=8 or -6
(b) sum of roots= 2α-2=-(3k-2)
3k=4-2α
k=(4-16)/3
k=-4
2013-10-05 5:15 am
The product of roots should be +48.
2013-10-05 3:15 am
For ax²+bx+c=0, product of roots = c/a.
2013-10-04 9:50 pm
why product of roots is α^2 - 2α = - 48
收錄日期: 2021-04-27 20:33:13
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https://hk.answers.yahoo.com/question/index?qid=20131004000051KK00028