1. -24w^2+6w+30
2. 42-30r^2-93r
I dont know why I cant use cross method to calculate these methods,especially when there is a negative no. in the coefficient! Pls,very urgent! Thx
Cross Method(EXPERTS NEEDED!)
2013-09-18 6:39 am
回答 (3)
2013-09-18 6:55 am
✔ 最佳答案
=^o^=http://s23.postimg.org/zd05g2tax/20130917_hk_math_force_deleted.png
剛剛被 Yahoo! foul左，心情勁差～ ^_^
等我計啦～
1. -24w² + 6w + 30
= -6 (4w² - w - 5)
= -6 (4w - 5) (w + 1)
2. 42 - 30r² - 93r
= - 30r² - 93r + 42
= -3 (10r² + 31r - 14)
= -3 (2r + 7) (5r - 2)
2013-09-18 11:52:03 補充：
Cheers~~ =^o^=
2013-09-18 7:24 am
Thank you for the answers for both of U!
2013-09-18 6:58 am
-24w^2 + 6w + 30
= -6(4w^2 - w - 5)
= -6(w + 1)(4w - 5)
= 6(w + 1)(5 - 4w)
42 - 30r^2 - 93r
= -3(10r^2 + 31r - 14)
= -3(5r - 2)(2r + 7)
= 3(2 - 5r)(2r + 7)
2013-09-18 09:00:21 補充：
you are welcome
= -6(4w^2 - w - 5)
= -6(w + 1)(4w - 5)
= 6(w + 1)(5 - 4w)
42 - 30r^2 - 93r
= -3(10r^2 + 31r - 14)
= -3(5r - 2)(2r + 7)
= 3(2 - 5r)(2r + 7)
2013-09-18 09:00:21 補充：
you are welcome
參考: knowledge
收錄日期: 2021-04-28 14:21:39
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20130917000051KK00264