如果sum of real roots 係-2,,product of 係-3,,錦化番入quadratic formula係點架?!
我唔識點轉d正負呀...
f.4,,如果sum of real roots 係-2,,product of 係-3,,錦quad. for.係?!
2008-09-25 7:33 am
回答 (1)
2008-09-25 8:13 am
✔ 最佳答案
quadratic formula is x^2 + 2x - 3 = 0因sum of real roots 係 -b / a
所以代入去時, b 會轉o左係 +2
而product of roots 係 c / a
所以代入就唔駛轉正負數
正確的是這樣的, x^2 - (sum of real roots)x + (product of real roots) = 0
參考: Myself
收錄日期: 2021-04-13 16:06:34
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080924000051KK03417